chore(package): update eslint-config-airbnb-base to version 12.0.2

Closes #9

Author: greenkeeper[bot]

package.json

@@ -24,7 +24,7 @@
     "babel-preset-es2015": "^6.24.0",
     "babel-register": "^6.24.0",
     "eslint": "^3.19.0",
-    "eslint-config-airbnb-base": "^11.1.3",
+    "eslint-config-airbnb-base": "^12.0.2",
     "eslint-plugin-import": "^2.2.0",
     "mocha": "^3.2.0"
   },