deps: Bump serve-static from 2.2.0 to 2.2.1

Bumps [serve-static](https://github.com/expressjs/serve-static) from 2.2.0 to 2.2.1.
- [Release notes](https://github.com/expressjs/serve-static/releases)
- [Changelog](https://github.com/expressjs/serve-static/blob/master/HISTORY.md)
- [Commits](expressjs/serve-static@v2.2.0...v2.2.1)

---
updated-dependencies:
- dependency-name: serve-static
  dependency-version: 2.2.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -39,7 +39,7 @@
 		"istanbul-lib-report": "^3.0.1",
 		"istanbul-reports": "^3.2.0",
 		"router": "^2.2.0",
-		"serve-static": "^2.2.0",
+		"serve-static": "^2.2.1",
 		"xml2js": "^0.6.2"
 	},
 	"devDependencies": {