drop support for PHP before 5.6

.travis.yml

@@ -6,9 +6,6 @@ php:
   - 7.1
   - 7.0
   - 5.6
-  - 5.5
-  - 5.4
-  - 5.3
   - hhvm
   - nightly
 
@@ -23,7 +20,7 @@ cache:
     - $HOME/.composer/cache
 
 before_script:
-  - bash -c "if [ $TRAVIS_PHP_VERSION != 'hhvm' ] && [ $TRAVIS_PHP_VERSION != '7.0' ] && [ $TRAVIS_PHP_VERSION != 'nightly' ]; then printf '\n\n\n\n' | pecl install pecl_http-1.7.6; fi"
+  #- bash -c "pecl install pecl_http-3.1.0"
   - composer require --prefer-source --dev symfony/event-dispatcher:${SYMFONY_VERSION}
 
 script: vendor/bin/phpunit -c phpunit.xml.travis -v
@@ -31,14 +28,14 @@ script: vendor/bin/phpunit -c phpunit.xml.travis -v
 after_success:
   - travis_retry php vendor/bin/coveralls -v
 
-matrix:
-  exclude:
-      - php: 5.3
-        env: SYMFONY_VERSION=3.0.*
-      - php: 5.4
-        env: SYMFONY_VERSION=3.0.*
-  allow_failures:
-      - php: 5.3
-      - php: nightly
+#matrix:
+#  exclude:
+#      - php: 5.3
+#        env: SYMFONY_VERSION=3.0.*
+#      - php: 5.4
+#        env: SYMFONY_VERSION=3.0.*
+#  allow_failures:
+#      - php: 5.3
+#      - php: nightly
 
 sudo: false

composer.json

@@ -12,7 +12,7 @@
         }
     ],
     "require": {
-        "php": ">=5.3.2",
+        "php": ">=5.6",
         "symfony/event-dispatcher": "~2.3|~3.0"
     },
     "require-dev": {
@@ -27,7 +27,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-develop": "3.3.x-dev"
+            "dev-develop": "4.0.x-dev"
         }
     },
     "autoload": {