Fixed broken build and remove depencency on taggable

Author: Nyholm

composer.json

@@ -26,8 +26,7 @@
         "php":                  "^5.5 || ^7.0",
         "psr/cache":            "^1.0",
         "psr/log":              "^1.0",
-        "cache/tag-interop":    "^1.0",
-        "cache/taggable-cache": "^0.4"
+        "cache/tag-interop":    "^1.0"
     },
     "require-dev":       {
         "phpunit/phpunit":         "^4.0 || ^5.1",