chore(package): update dependencies

https://greenkeeper.io/

package.json

@@ -36,7 +36,7 @@
     "chai": "^3.5.0",
     "codeclimate-test-reporter": "^0.4.0",
     "coveralls": "^2.11.12",
-    "eslint": "3.9.0",
+    "eslint": "3.9.1",
     "generate-changelog": "^1.0.2",
     "istanbul": "^0.4.4",
     "mocha": "^3.0.1",