Update to latest version of hierarchy (#87)

Author: Nyholm

composer.json

@@ -27,7 +27,7 @@
         "php":                      "^5.5 || ^7.0",
         "psr/cache":                "^1.0",
         "cache/adapter-common":     "^0.3",
-        "cache/hierarchical-cache": "^0.2",
+        "cache/hierarchical-cache": "^0.3",
         "cache/taggable-cache":     "^0.4"
     },
     "require-dev":       {