chore(package): update eslint to version 6.2.2

Closes #41

Author: greenkeeper[bot]

package.json

@@ -38,7 +38,7 @@
     "babel-istanbul": "0.12.2",
     "babel-plugin-transform-export-extensions": "6.22.0",
     "babel-preset-node6": "11.0.0",
-    "eslint": "4.6.0",
+    "eslint": "6.2.2",
     "chai": "4.1.2",
     "coveralls": "2.13.2",
     "global": "4.3.2",