Require stable versions of cache/* packages

Author: Nyholm

composer.json

@@ -38,7 +38,7 @@
     "require-dev": {
         "phpunit/phpunit":         "^5.7.21",
         "cache/integration-tests": "^0.16",
-        "cache/array-adapter":     "^0.5"
+        "cache/array-adapter":     "^1.0"
     },
     "autoload":    {
         "psr-4":                 {