chore(package): update dependencies

Author: greenkeeper[bot]

package.json

@@ -33,11 +33,11 @@
     "is-file": "~1.0.0",
     "meow": "~3.7.0",
     "run-series": "~1.1.4",
-    "update-notifier": "~2.1.0",
-    "worker-farm": "~1.3.1"
+    "update-notifier": "~2.2.0",
+    "worker-farm": "~1.4.1"
   },
   "devDependencies": {
-    "async": "~2.4.0",
+    "async": "~2.5.0",
     "coveralls": "latest",
     "git-dirty": "latest",
     "min-delay": "~1.0.1",