Make sure to use 2.0 of the bridge

Author: Nyholm

composer.json

@@ -30,9 +30,9 @@
         "psr/cache-implementation":    "~1.0"
     },
     "require-dev":  {
-        "phpunit/phpunit":        "^5.1|^4.0",
-        "cache/psr-6-doctrine-bridge": "^0.1",
-        "cache/doctrine-adapter": "^0.1"
+        "phpunit/phpunit":             "^5.1|^4.0",
+        "cache/psr-6-doctrine-bridge": "^2.0",
+        "cache/doctrine-adapter":      "^0.1"
     },
     "suggest":      {
         "cache/doctrine-adapter-bundle": "A bundle to register PSR-6 compliant services based on Doctrine cache",