chore(package): update eslint-config-airbnb to version 15.0.2

Closes #226

Author: greenkeeper[bot]

package.json

@@ -45,7 +45,7 @@
     "codecov": "1.0.1",
     "enzyme": "2.6.0",
     "eslint": "3.12.2",
-    "eslint-config-airbnb": "13.0.0",
+    "eslint-config-airbnb": "15.0.2",
     "eslint-plugin-import": "2.2.0",
     "eslint-plugin-jsx-a11y": "2.2.3",
     "eslint-plugin-react": "6.8.0",