Merge pull request #62 from OpenClassrooms/remove-psr-cache-conflict

feat(cache): remove psr/cache version conflict

Author: sidux

composer.json

@@ -80,9 +80,6 @@
     "symfony/lock": "For Symfony integration with Lock",
     "doctrine/orm": "For Doctrine integration with Transaction and legacy Cache"
   },
-  "conflict": {
-    "psr/cache": ">=3.0"
-  },
   "extra": {
     "branch-alias": {
       "dev-master": "2.0.x-dev"