chore(deps): update dependency standard to v12

Author: renovate-bot

package.json

@@ -37,7 +37,7 @@
     "nyc": "12.0.2",
     "pre-commit": "1.2.2",
     "sinon": "6.1.4",
-    "standard": "11.0.1",
+    "standard": "12.0.0",
     "vue": "2.5.16",
     "vuex": "3.0.1"
   },