chore(package): update unity-cache to version 2.0.0

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -75,7 +75,7 @@
     "rimraf": "^2.5.4",
     "sinon": "^1.17.6",
     "unity-api": "^1.0.3",
-    "unity-cache": "^1.1.0",
+    "unity-cache": "^2.0.0",
     "validate-commit-msg": "^2.10.1"
   },
   "ava": {