chore(package): update eslint to version 6.2.2

Closes #9

Author: greenkeeper[bot]

package.json

@@ -39,7 +39,7 @@
   },
   "devDependencies": {
     "babel-eslint": "^10.0.0",
-    "eslint": "^5.0.0",
+    "eslint": "^6.2.2",
     "jsdoc": "^3.5.4",
     "nodemon": "^1.12.0"
   },