Update dependency standard to v12

Author: renovate-bot

package.json

@@ -33,7 +33,7 @@
     "jest": "^20.0.4",
     "js-yaml": "^3.9.1",
     "react-test-renderer": "^16.0.0",
-    "standard": "^11.0.0",
+    "standard": "^12.0.0",
     "style-loader": "^0.20.0",
     "webpack": "^3.5.5",
     "webpack-dev-server": "^2.7.1",