chore(package): update eslint to version 6.2.2

Closes #108

Author: greenkeeper[bot]

package.json

@@ -27,7 +27,7 @@
     "moneyd": "./bin/moneyd.js"
   },
   "devDependencies": {
-    "eslint": "^5.3.0",
+    "eslint": "^6.2.2",
     "eslint-config-standard": "^11.0.0-beta.0",
     "eslint-plugin-import": "^2.8.0",
     "eslint-plugin-node": "^7.0.1",