build(deps): bump https-proxy-agent from 2.1.0 to 2.2.1

[dependabot[bot]]

Bumps https-proxy-agent from 2.1.0 to 2.2.1.

Release notes

*Sourced from [https-proxy-agent's releases](https://github.com/TooTallNate/node-https-proxy-agent/releases).* > ## 2.2.1 > ### Patches > > - Add `defaultPort` field: [#43](https://github-redirect.dependabot.com/TooTallNate/node-https-proxy-agent/issues/43) > > ### Credits > > Huge thanks to [@​jan](https://github.com/jan)-auer for helping! > > ## 2.2.0 > ### Minor Changes > > - Use `Buffer.from()`: 1c24219df87524e6ed973127e81f30801d658f07 > - Add "engines" to package.json: a27792225b652c5483247c96654d40bda27873d0

Changelog

*Sourced from [https-proxy-agent's changelog](https://github.com/TooTallNate/node-https-proxy-agent/blob/master/History.md).* > > 2.2.0 / 2018-03-03 > ================== > > * Add "engines" to package.json - requires Node.js >= 4.5.0 > * Use `Buffer.from()` > > 2.1.1 / 2017-11-28 > ================== > > * Update `debug` - Security Problems with Previous Version ([#38](https://github-redirect.dependabot.com/TooTallNate/node-https-proxy-agent/issues/38))

Commits

- [`8c3a75b`](https://github.com/TooTallNate/node-https-proxy-agent/commit/8c3a75baddecae7e2fe2921d1adde7edd0203156) 2.2.1 - [`84a1210`](https://github.com/TooTallNate/node-https-proxy-agent/commit/84a121078c67351e5ca7bef9c16e2d547a1e9840) Add `defaultPort` field ([#43](https://github-redirect.dependabot.com/TooTallNate/node-https-proxy-agent/issues/43)) - [`b9d5b7e`](https://github.com/TooTallNate/node-https-proxy-agent/commit/b9d5b7ec336264e9d8208287654060ae9a880976) 2.2.0 - [`a277922`](https://github.com/TooTallNate/node-https-proxy-agent/commit/a27792225b652c5483247c96654d40bda27873d0) Add "engines" to package.json - [`1c24219`](https://github.com/TooTallNate/node-https-proxy-agent/commit/1c24219df87524e6ed973127e81f30801d658f07) Use `Buffer.from()` - [`c58d365`](https://github.com/TooTallNate/node-https-proxy-agent/commit/c58d365dd153104d1147967a0a6b4e1dd1698e50) Release 2.1.1 - [`7d221cf`](https://github.com/TooTallNate/node-https-proxy-agent/commit/7d221cf07503d4c56a3c2991e9a0ce029e655e30) Update Debug - Security Problems with Previous Version ([#38](https://github-redirect.dependabot.com/TooTallNate/node-https-proxy-agent/issues/38)) - See full diff in [compare view](https://github.com/TooTallNate/node-https-proxy-agent/compare/2.1.0...2.2.1)

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[dependabot[bot]]

Superseded by #57.