chore(package): update eslint to version 5.15.1

Closes #187

Author: greenkeeper[bot]

package.json

@@ -56,7 +56,7 @@
   },
   "devDependencies": {
     "chai": "4.2.0",
-    "eslint": "5.6.1",
+    "eslint": "5.15.1",
     "eslint-config-airbnb-base": "13.1.0",
     "eslint-plugin-import": "2.14.0",
     "glob": "7.1.3",