Upgrade standard devDependency from ^11.0.1 to ^12.0.1

Author: vweevers

package.json

@@ -18,7 +18,7 @@
     "hallmark": "^0.1.0",
     "level-community": "^3.0.0",
     "nyc": "^12.0.2",
-    "standard": "^11.0.1",
+    "standard": "^12.0.1",
     "tape": "^4.9.1"
   },
   "hallmark": {