updated eslint

Author: trygve-lie

package.json

@@ -34,7 +34,7 @@
   "devDependencies": {
     "babel-preset-es2015": "6.24.1",
     "babelify": "7.3.0",
-    "eslint": "^3.12.2",
+    "eslint": "^4.1.1",
     "eslint-config-finn": "^2.0.0",
     "tap": "10.7.0"
   },