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

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -51,7 +51,7 @@
     "unity-utils": "^1.0.4"
   },
   "peerDependencies": {
-    "unity-api": "^1.0.3"
+    "unity-api": "^2.0.0"
   },
   "devDependencies": {
     "ava": "^0.18.1",