Bump serve from 6.4.4 to 7.1.3#1

Bumps [serve](https://github.com/zeit/serve) from 6.4.4 to 7.1.3. <details> <summary>Release notes</summary> *Sourced from [serve's releases](https://github.com/zeit/serve/releases).* > ## 7.1.3 > ### Patches > > - Bumped middleware to the latest version: [#391](https://github-redirect.dependabot.com/zeit/serve/issues/391) > > ## 7.1.2 > ### Patches > > - Bumped our dependencies to the latest version: [#388](https://github-redirect.dependabot.com/zeit/serve/issues/388) > > ## 7.1.1 > ### Patches > > - Added example of using the middleware: [#385](https://github-redirect.dependabot.com/zeit/serve/issues/385) > > ## 7.1.0 > ### Minor Changes > > - Re-added `--single` and made `--listen` support ports: [#384](https://github-redirect.dependabot.com/zeit/serve/issues/384) > > ### Patches > > - Fixed &quot;URL is not defined&quot; error: [#381](https://github-redirect.dependabot.com/zeit/serve/issues/381) > - Bumped `serve-handler` to the latest version: [#383](https://github-redirect.dependabot.com/zeit/serve/issues/383) > > ### Credits > > Huge thanks to [@&#8203;jaeseok-park](https://github.com/jaeseok-park) for helping! > > ## 7.0.1 > ### Patches > > - Removed useless dependencies: [#377](https://github-redirect.dependabot.com/zeit/serve/issues/377) > > ## 7.0.0 > This release marks a completely fresh start for this project. > > Over the years, the core of the package has gotten bigger and bigger, eventually containing features that should not be part of it at all. This led to `serve` becoming rather slow in certain situations. But not just in terms of serving requests, but also when installing (because of the dependency count). > > As of today, the package is going into a completely new direction and we're re-evaluating any feature suggestions we're encoutering on the repository. > > If you want to continue using the old `serve`, please lock it like this in your dependencies: > > ```json > { > "serve": "6.5.8" > } > ``` > > Notice that the version number is **not** prefixed with `^`. ></tr></table> ... (truncated) </details> <details> <summary>Commits</summary> - [`ff4faf9`](https://github.com/zeit/serve/commit/ff4faf9fd039473693c9d8b854aa13c3f5c1cdb1) 7.1.3 - [`b822208`](https://github.com/zeit/serve/commit/b822208c87141d7e4daee11b37003262f7d8d0e9) Bumped middleware to the latest version ([#391](https://github-redirect.dependabot.com/zeit/serve/issues/391)) - [`82c99b6`](https://github.com/zeit/serve/commit/82c99b6a7512be3f0d2bf55b339e6939856eb3c9) 7.1.2 - [`43f5bc7`](https://github.com/zeit/serve/commit/43f5bc781ffda3cdc5f528eafc8b7a51039a6504) Bumped our dependencies to the latest version ([#388](https://github-redirect.dependabot.com/zeit/serve/issues/388)) - [`74e3607`](https://github.com/zeit/serve/commit/74e360781dd62a93d505e57c09087a49fa4c33a2) 7.1.1 - [`2c8a701`](https://github.com/zeit/serve/commit/2c8a7013099390d9b9772fe80d8d02dd23a6c37b) Added example of using the middleware ([#385](https://github-redirect.dependabot.com/zeit/serve/issues/385)) - [`a567a0a`](https://github.com/zeit/serve/commit/a567a0a3fde1e4a30da88678db2d7c219aeb6b6b) 7.1.0 - [`4f135ea`](https://github.com/zeit/serve/commit/4f135eac11a060a044402e79670356e6cd144043) Re-added `--single` and made `--listen` support ports ([#384](https://github-redirect.dependabot.com/zeit/serve/issues/384)) - [`5d8a9d2`](https://github.com/zeit/serve/commit/5d8a9d2679d7b8af235ae7fc49e5357f2cac8b43) Bumped `serve-handler` to the latest version ([#383](https://github-redirect.dependabot.com/zeit/serve/issues/383)) - [`5b1840c`](https://github.com/zeit/serve/commit/5b1840c42252c1f8ac38e48c0b5d3984559a8569) Fixed "URL is not defined" error ([#381](https://github-redirect.dependabot.com/zeit/serve/issues/381)) - Additional commits viewable in [compare view](https://github.com/zeit/serve/compare/6.4.4...7.1.3) </details> <br /> [](https://help.github.com/articles/configuring-automated-security-fixes) Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`. 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