chore(package): update dependencies

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -30,9 +30,9 @@
     "stylelint-selector-no-utility": "^1.2.0"
   },
   "devDependencies": {
-    "ava": "^0.15.2",
+    "ava": "^0.16.0",
     "eslint": "^3.0.1",
-    "eslint-plugin-github": "^0.4.0",
+    "eslint-plugin-github": "^0.5.0",
     "stylelint": "^7.0.0"
   },
   "peerDependencies": {