chore(package): update eslint to version 6.0.1

Closes #103

Author: greenkeeper[bot]

package.json

@@ -26,7 +26,7 @@
     "moneyd": "./bin/moneyd.js"
   },
   "devDependencies": {
-    "eslint": "^5.3.0",
+    "eslint": "^6.0.1",
     "eslint-config-standard": "^11.0.0-beta.0",
     "eslint-plugin-import": "^2.8.0",
     "eslint-plugin-node": "^7.0.1",