Bump standard from 14.3.4 to 15.0.0

Bumps [standard](https://github.com/standard/standard) from 14.3.4 to 15.0.0.
- [Release notes](https://github.com/standard/standard/releases)
- [Changelog](https://github.com/standard/standard/blob/master/CHANGELOG.md)
- [Commits](standard/standard@v14.3.4...v15.0.0)

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -17,7 +17,7 @@
     "ava": "^3.0.0",
     "express": "^4.16.3",
     "nyc": "^15.0.0",
-    "standard": "^14.0.0"
+    "standard": "^15.0.0"
   },
   "repository": {
     "type": "git",