Require stable versions of cache/* packages

Author: Nyholm

composer.json

@@ -21,7 +21,7 @@
     "require":           {
         "php":                      "^5.6 || ^7.0",
         "psr/cache":                "^1.0",
-        "cache/hierarchical-cache": "^0.3 || ^0.4"
+        "cache/hierarchical-cache": "^1.0"
     },
     "require-dev":       {
         "phpunit/phpunit":         "^5.7.21"