chore(package): update standard to version 12.0.0 (#20)

Author: greenkeeper[bot]

package.json

@@ -32,7 +32,7 @@
     "pre-commit": "^1.2.2",
     "simple-get": "^3.0.0",
     "snazzy": "^8.0.0",
-    "standard": "^11.0.0",
+    "standard": "^12.0.0",
     "tap": "^12.0.0"
   },
   "dependencies": {