Added Symfony Logger assertion (dontSeeDeprecations)

[TavoNiievez]

       $I->amOnPage('/home');
       $I->dontSeeDeprecations();

 Step  Don't see deprecations
 Fail  Found 2 deprecation messages in the log:
  - Since doctrine/doctrine-bundle 2.12: The default value of "doctrine.orm.controller_resolver.auto_mapping" will be changed from `true` to `false`...
  - Since doctrine/doctrine-bundle 2.13: Enabling the controller resolver automapping feature has been deprecated....
Failed asserting that an array is empty.

[TavoNiievez]

cc. @xEdelweiss @ThomasLandauer

[ThomasLandauer]

Asserts that there are no deprecation messages in Symfony's log.

[TavoNiievez]

Fixed, thank you :)