chore(package): update eslint to version 6.5.1

Closes #30

Author: greenkeeper[bot]

package.json

@@ -43,7 +43,7 @@
     "babel-preset-es2015": "^6.6.0",
     "code": "^4.0.0",
     "coveralls": "^2.11.9",
-    "eslint": "^3.1.0",
+    "eslint": "^6.5.1",
     "eslint-watch": "^2.1.10",
     "lab": "^11.0.0",
     "npm-run-all": "^3.0.0",