fixed dev dependencies

Author: Nyholm

composer.json

@@ -31,7 +31,7 @@
     "require-dev":  {
         "phpunit/phpunit":             "^5.1|^4.0",
         "cache/psr-6-doctrine-bridge": "^2.0",
-        "cache/doctrine-adapter":      "^0.3"
+        "cache/array-adapter":         "@stable"
     },
     "suggest":      {
         "cache/doctrine-adapter-bundle": "A bundle to register PSR-6 compliant services based on Doctrine cache",