chore(package): update eslint-config-standard to version 12.0.0 (#94)

Author: greenkeeper[bot]

package.json

@@ -19,7 +19,7 @@
   "devDependencies": {
     "codecov": "^3.0.4",
     "eslint": "^5.1.0",
-    "eslint-config-standard": "^11.0.0",
+    "eslint-config-standard": "^12.0.0",
     "eslint-plugin-import": "^2.13.0",
     "eslint-plugin-node": "^7.0.1",
     "eslint-plugin-promise": "^4.0.0",