chore(package): update eslint to version 4.7.2

Closes #16

Author: greenkeeper[bot]

package.json

@@ -38,7 +38,7 @@
   "devDependencies": {
     "babel-eslint": "^7.1.1",
     "enzyme": "^2.7.0",
-    "eslint": "^3.12.2",
+    "eslint": "^4.7.2",
     "eslint-config-airbnb-base": "^11.0.0",
     "eslint-plugin-import": "^2.2.0",
     "jest": "^19.0.1"