Bump servor from 3.3.1 to 4.0.2

Bumps [servor](https://github.com/lukejacksonn/servor) from 3.3.1 to 4.0.2.
- [Release notes](https://github.com/lukejacksonn/servor/releases)
- [Commits](https://github.com/lukejacksonn/servor/commits)

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

package.json

@@ -66,7 +66,7 @@
         "rollup-plugin-size-snapshot": "^0.11.0",
         "rollup-plugin-svgo": "^1.1.0",
         "rollup-plugin-terser": "^5.3.0",
-        "servor": "^3.3.1",
+        "servor": "^4.0.2",
         "travis-size-report": "^1.1.0"
     }
 }