Update dependencies to enable Greenkeeper 🌴 (#72)

* chore(package): update dependencies

https://greenkeeper.io/

* Update to eslint-config-airbnb-base v11.0.1

This version updates the peerDependencies so it needs to be explicitely
listed.

* Update ESLint to v3.13.0

Necessary to satisfy the peerDependencies of
`[email protected]`.

Author: greenkeeper[bot]

package.json

@@ -30,9 +30,9 @@
     "jsonlint": "~1.6.2"
   },
   "devDependencies": {
-    "eslint": "^3.6.0",
-    "eslint-config-airbnb-base": "^8.0.0",
-    "eslint-plugin-import": "^1.16.0"
+    "eslint": "^3.13.0",
+    "eslint-config-airbnb-base": "^11.0.1",
+    "eslint-plugin-import": "^2.2.0"
   },
   "eslintConfig": {
     "rules": {