This PR was merged into the master branch.

Discussion
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Update instructions to use ~1.1 instead of ~1.0

Please also update http://silex.sensiolabs.org/download which is not only forgotten every time because it's not part of the repo, it's also outdated *right now*...

Commits
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9685e904 use tilde operator for pimple require
69c545c6 Update constraints from ~1.0 to ~1.1