fix(eslint-plugin-standard): update to v3.1.0

Author: greenkeeper[bot]

package.json

@@ -67,7 +67,7 @@
     "eslint-plugin-prettier": "^2.2.0",
     "eslint-plugin-promise": "3.7.0",
     "eslint-plugin-security": "1.4.0",
-    "eslint-plugin-standard": "3.0.1",
+    "eslint-plugin-standard": "3.1.0",
     "eslint-plugin-unicorn": "4.0.3",
     "eslint-plugin-xss": "0.1.9",
     "fixpack": "2.3.1",