Bump ytdl-core from 0.20.4 to 0.21.1

[dependabot-preview[bot]]

Bumps ytdl-core from 0.20.4 to 0.21.1.

Release notes

*Sourced from [ytdl-core's releases](https://github.com/fent/node-ytdl-core/releases).* > ## v0.21.1 > No release notes provided. > > ## v0.21.0 > > > ### Features > > * start from latest segment on live streams ([6309425](https://github.com/fent/node-ytdl-core/commit/6309425)), closes [#157](https://github-redirect.dependabot.com/fent/node-ytdl-core/issues/157) [#263](https://github-redirect.dependabot.com/fent/node-ytdl-core/issues/263)

Commits

- [`b4a4b36`](https://github.com/fent/node-ytdl-core/commit/b4a4b36234737dcb31f40289f8ad83f783c1ed24) chore(release): 0.21.1 - [`65c31d3`](https://github.com/fent/node-ytdl-core/commit/65c31d35c352d76ae6a567f8b52c9bddb371137b) docs(typings): update typings for live streams - [`09a0614`](https://github.com/fent/node-ytdl-core/commit/09a0614ee1c4b2efaf66d10ae3110b1d2bf040d6) docs(typings): added missing begin option from downloadOptions typings ([#339](https://github-redirect.dependabot.com/fent/node-ytdl-core/issues/339)) - [`326df2f`](https://github.com/fent/node-ytdl-core/commit/326df2f8a323475ba7439d80fcc4297742e329c0) chore(release): 0.21.0 - [`6309425`](https://github.com/fent/node-ytdl-core/commit/63094254124dd52886dec881586fc0bb7557f70d) feat: start from latest segment on live streams - [`facf299`](https://github.com/fent/node-ytdl-core/commit/facf2991d5bd4a0e21ed5c87fc0fba6355e8d4a2) refactor: move parse-time to m3u8stream - [`643bdee`](https://github.com/fent/node-ytdl-core/commit/643bdeeac3348d80a2b41fc9fbaf98d4a537106b) chore(package): update sinon to version 6.0.0 ([#328](https://github-redirect.dependabot.com/fent/node-ytdl-core/issues/328)) - [`d8db172`](https://github.com/fent/node-ytdl-core/commit/d8db17291b2097349f59526d5837bdaeff2922ea) style: a bit more linting - [`e057c19`](https://github.com/fent/node-ytdl-core/commit/e057c190970a36368f2f84270d931ccdd30cc531) style: update var to es6 ([#325](https://github-redirect.dependabot.com/fent/node-ytdl-core/issues/325)) - [`6c49161`](https://github.com/fent/node-ytdl-core/commit/6c491617cd76b3f6af18caa80bbe5c01e7f35838) docs(readme): add note about download rate - Additional commits viewable in [compare view](https://github.com/fent/node-ytdl-core/compare/v0.20.4...v0.21.1)

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[dependabot-preview[bot]]

Superseded by #9.