Updated changelog

CHANGELOG.md

-# CHANGELOG
+# Changelog
+All notable changes to this project will be documented in this file.
 
-## 3.x - Unreleased
+The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
-## 3.9.0-alpha - 2018-01-19
+## [Unreleased]
+### Added
+### Changed
+### Fixed
 
-- (backport) Fixes bugs from PR #484: fix Http adapter for extraction requests (PR #519)
-- Updated PHP annotations and docblock (PR #526)
-- Performance updates for formatting values (PR #485)
+## [3.9.0-alpha] - 2018-01-19
+## Added
 - Provide fluent interface (PR #483)
 
-## 3.8.1 - 2017-02-02
-
-- bugfix: restore PHP 5.3 compatibility (remove short array syntax)
-
-## 3.8.0 - 2017-01-31
-
-- bugfix: use GET request for extracting remote files
-- added: support for simple group format in response parser
-- added: helper for fetching ValueGroup from a Grouped result
-- bugfix: prevent ParallelExecution Curl spinloop
-- added: Guzzle 3 and Guzzle 6 client adapters
-- improvement: various fixes in documentation
-
-## 3.7.0 - 2016-10-28
-
-- added: support for nested documents in update query
-- added: spatial component for select query
-- added: support for keys and excludes in interval facet
-- added: support for grouping using a function (group.func)
-- bugfix: spellcheck collation parsing for Solr 5+
-- improvement: lots of fixes in documentation markup
-- added: included suggestion in composer file for a query builder library
-
-## 3.6.0 - 2016-05-03
-
-- improvement: no longer allow failures for HHVM in continuous integration
-- improvement: added Symfony 3.x components to CI tests for PHP 5.5+
-- added: support for replicas in distributed search
-- added: support for multiple boost queries in dismax
-- added: support for additional stats values like percentiles
-- improvement: several typo / markup fixes in documentation
-- improvement: several docblock fixes
-- improvement: ClientInterface now also used for standard Client class
-
-## 3.5.1
-
-- fix backwards incompatible change in classnames
-
-## 3.5.0 - 2015-12-09
-
-- improvement: lots of code style fixes
-- improvement: refactored 'base' plugin class to AbstractPlugin
-- improvement: removed old PHP environments for Travis, added PHP7
-- improvement: set license to a valid SPDX license identifier
-- bugfix: PHAR generator updated to support namespacing
-- bugfix: Collations broken for Solr 5 data format
-- added: Make it possible to bypass (system-wide) proxy setting in Curl adapter
-- improvement: Added SensioLabs Insight (including lots of fixed in the code based on report)
-- added: ClientInterface
-- improvement: Set hard paths in .gitignore to prevent tree lookups
-- added: Support for facet.contains settings
-- improvement: updated Symfony event dispatcher dependency to a maintained version
-- added: docs in repository (markdown format)
-
-## 3.4.0 - 2015-06-14
-
-- bugfix: only check type for added documents to add query if provided as an array
-- improvement: added support for calling empty() and isset() on result document properties
-- improvement: added composer test script
-- bugfix: curl file upload handling
-- improvement: added 'contributing' file
-- improvement: docblock fixes in grouping component facets
-- added: facet interval support
-- added: ZF2 http adapter
-- added: stats for pivot facet
-- bugfix: spellcheck 'collations' and 'correctlyspelled' updated to support Solr 5 format
-- bugfix: curl adapter now uses Solr 5 compatible headers for a GET request
-- improvement: lots of code style fixes, using the SF2 code style
-
-
-## 3.3.0 - 2014-11-16
-
-- improvement: fixes in build.xml (use phpunit in vendor directory)
-- improvement: added support for nested debug-info in the debug query
-- new feature: added support for data fixtures
-- improvement: filter control characters in update documents by default
-- bugfix: pivot facet does not accept extra parameters
-- improvement: Facet range now supports the mincount parameter
-- improvement: Spellcheck response parser can now handle multiple suggestions
-- bugfix: Pivot facet uses the wrong key in result parsing
-- bugfix: Wrong handling of boolean values in update documents
-- improvement: Removed constructor from interface Solarium/Core/ConfigurableInterface.php
-- improvement: Prefetch iterator now resets if prefetch or query settings are changed
-- improvement: Added matchoffset setting to MLT querytype
-- bugfix: Highlight query should only set hl.fl param if there are any fields set
-- bugfix: Curl crash when open_basedir is set
-- improvement: PreFetchIterator plugin now supports setting an endpoint
-- improvement: BufferedAdd plugin now supports an endpoint supplied as a config
-- improvement: Updated curl adapter file handling to prevent warnings in php >=5.5.0
-- improvement: Added remote file streaming support to extract request handler
-- improvement: Query result now also supports maxscore
-- new feature: Added MinimumScoreFilter plugin, also for grouping
-- improvement: MoreLikeThis now allows for individual boosts on query fields
-- bugfix: Fix suggester parser with duplicates
-- improvement: Select query component MoreLikeThis now supports boosting multiple fields
-- improvement: added PHP 5.5, 5.6 and HHVM to Travis config
-- improvement: Solarium now uses Coveralls for test coverage reports
-- improvement: if a config object does not supply a toArray method, the object is converted by Solarium
-- improvement: Highlighting now supports hl.preserveMulti param
-- improvement: Stats component now supports exludes
-- improvement: Range query helper now supports wildcards
-- improvement: Support HTTPS scheme for endpoints
-- improvement: CURL and PECL_HTTP adapters now set connection timeout and dns cache timeout
-- improvement: Extract query now supports ExtractOnly
-- improvement: The event dispatcher can now be injected
-- improvement: PSR-0 and PSR-2 code fixes
+### Changed
+- Performance updates for formatting values (PR #485)
+- Updated PHP annotations and docblock (PR #526)
+
+### Fixed
+- (backport) Fixes bugs from PR #484: fix Http adapter for extraction requests (PR #519)
+
+## [3.8.1] - 2017-02-02
+### Fixed
+- Restore PHP 5.3 compatibility (remove short array syntax)
+
+## [3.8.0] - 2017-01-31
+### Added
+- Support for simple group format in response parser
+- Helper for fetching ValueGroup from a Grouped result
+- Guzzle 3 and Guzzle 6 client adapters
+
+### Changed
+- Various fixes in documentation
+
+### Fixed
+- Use GET request for extracting remote files
+- Prevent ParallelExecution Curl spinloop
+
+## [3.7.0] - 2016-10-28
+### Added
+- Support for nested documents in update query
+- Spatial component for select query
+- Support for keys and excludes in interval facet
+- Support for grouping using a function (group.func)
+- Included suggestion in composer file for a query builder library
+
+### Changed
+- Lots of fixes in documentation markup
+
+### Fixed
+- Spellcheck collation parsing for Solr 5+
+
+## [3.6.0] - 2016-05-03
+### Added
+- Support for replicas in distributed search
+- Support for multiple boost queries in dismax
+- Support for additional stats values like percentiles
+- Added Symfony 3.x components to CI tests for PHP 5.5+
+
+### Changed
+- No longer allow failures for HHVM in continuous integration
+- ClientInterface now also used for standard Client class
+
+### Fixed
+- Several typo / markup fixes in documentation
+- Several docblock fixes
+
+
+## [3.5.1] - 2015-12-15
+### Fixed
+- backwards incompatible change in classnames
+
+## [3.5.0] - 2015-12-14
+### Added
+- Make it possible to bypass (system-wide) proxy setting in Curl adapter
+- ClientInterface
+- Support for facet.contains settings
+- Docs in repository (markdown format)
+- SensioLabs Insight (including lots of fixed in the code based on report)
+
+### Changed
+- Lots of code style fixes
+- Refactored 'base' plugin class to AbstractPlugin
+- Removed old PHP environments for Travis, added PHP7
+- Set license to a valid SPDX license identifier
+- Set hard paths in .gitignore to prevent tree lookups
+- Updated Symfony event dispatcher dependency to a maintained version
+
+### Fixed
+- PHAR generator updated to support namespacing
+- Collations broken for Solr 5 data format
+
+## [3.4.0] - 2015-06-14
+### Added
+- Facet interval support
+- ZF2 http adapter
+- Stats for pivot facet
+- Support for calling empty() and isset() on result document properties
+- Composer test script
+- 'contributing' file
+
+### Changed
+- Lots of code style fixes, using the SF2 code style
+
+### Fixed
+- Docblock fixes in grouping component facets
+- Only check type for added documents to add query if provided as an array
+- Curl file upload handling
+- Spellcheck 'collations' and 'correctlyspelled' updated to support Solr 5 format
+- Curl adapter now uses Solr 5 compatible headers for a GET request
+
+
+## [3.3.0] - 2014-11-16
+### Added
+- Support for data fixtures
+- MinimumScoreFilter plugin, also for grouping
+- Support for nested debug-info in the debug query
+
+### Changed
+- Filter control characters in update documents by default
+- Facet range now supports the mincount parameter
+- Spellcheck response parser can now handle multiple suggestions
+- Prefetch iterator now resets if prefetch or query settings are changed
+- Added matchoffset setting to MLT querytype
+- PreFetchIterator plugin now supports setting an endpoint
+- BufferedAdd plugin now supports an endpoint supplied as a config
+- Updated curl adapter file handling to prevent warnings in php >=5.5.0
+- Added remote file streaming support to extract request handler
+- Query result now also supports maxscore
+- MoreLikeThis now allows for individual boosts on query fields
+- Select query component MoreLikeThis now supports boosting multiple fields
+- Added PHP 5.5, 5.6 and HHVM to Travis config
+- Solarium now uses Coveralls for test coverage reports
+- If a config object does not supply a toArray method, the object is converted by Solarium
+- Highlighting now supports hl.preserveMulti param
+- Stats component now supports exludes
+- Range query helper now supports wildcards
+- Support HTTPS scheme for endpoints
+- CURL and PECL_HTTP adapters now set connection timeout and dns cache timeout
+- Extract query now supports ExtractOnly
+- The event dispatcher can now be injected
+- PSR-0 and PSR-2 code fixes
+
+### Fixed
+- Fixes in build.xml (use phpunit in vendor directory)
+- Pivot facet does not accept extra parameters
+- Pivot facet uses the wrong key in result parsing
+- Wrong handling of boolean values in update documents
+- Highlight query should only set hl.fl param if there are any fields set
+- Curl crash when open_basedir is set
+- Fix suggester parser with duplicates
+- Removed constructor from interface Solarium/Core/ConfigurableInterface.php