Updated travis config (php-cache#90)

* Test on symfony 4

* sort packages

* Fixed tests

* Removed debug code

* Adding doctrine annotations and force new versions of PHPUnut

* typo

* Better deps

* Bugfix

* serializer-bundle does not exists =)

* cs

* Better specify versions

* Test fix on sf2.7

* minor

* cs

Changing type

Update Changelog.md

prepare for 1.0.1 (php-cache#83)

Prepare for 1.0.0 (php-cache#81)

Marked classes as internal (php-cache#72)

* Marked some classes as internal

* Added changelog

* minor

Updating session handler is breaking old cache.

Updated dependencies to avoid bug in underlying libraries. (php-cache#64

)

Added changelog (php-cache#61)

Merge pull request php-cache#54 from php-cache/logo

Added logo in toolbar