chore(deps): update dependency typescript to v2.8.1

[renovate[bot]]

This Pull Request updates dependency typescript from v2.7.2 to v2.8.1

Note: This PR was created on a configured schedule ("before 3am on Monday") and will not receive updates outside those times.

Release Notes

### [`v2.8.1`](https://github.com/Microsoft/TypeScript/releases/v2.8.1) For release notes, check out the [release announcement](https://blogs.msdn.microsoft.com/typescript/2018/03/27/announcing-typescript-2-8/) For new features, check out the [What's new in TypeScript 2.8](https://github.com/Microsoft/TypeScript/wiki/What's-new-in-TypeScript#typescript-28). For breaking changes, check out the [Breaking changes in TypeScript 2.8](https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#typescript-28) page. For the complete list of fixed issues, check out the issues fixed in [TypeScript 2.8 RC](https://github.com/Microsoft/TypeScript/issues?q=is%3Aissue+milestone%3A%22TypeScript+2.8%22+label%3A%22fixed%22+) and [after TypeScript 2.8 RC](https://github.com/Microsoft/TypeScript/issues?q=is%3Aissue+milestone%3A%22TypeScript+2.8.1%22+label%3A%22fixed%22+). Download: - [npm](https://www.npmjs.com/package/typescript) - [Visual Studio 2015 plugin](https://www.microsoft.com/en-us/download/details.aspx?id=48593) - [Visual Studio 2017](https://www.microsoft.com/en-us/download/details.aspx?id=55258) ([Select new version in project options](https://github.com/Microsoft/TypeScript/wiki/Updating-TypeScript-in-Visual-Studio-2017)) - [NuGet package](https://www.nuget.org/packages/Microsoft.TypeScript.MSBuild/2.8.1) Special thanks to all contributors to this release: * Aditya Daflapurkar * Adnan Chowdhury * Adrian Leonhard * Alan Agius * Alex Eagle * Anders Hejlsberg * Andrew Casey * Andy Hanson * Armando Aguirre * Benjamin Lichtman * Daniel Rosenwasser * Eric Grube * Esakki Raj * Herrington Darkholme * Jack Williams * Josh Goldberg * Klaus Meinhardt * Martyn Janes * Matt McCutchen * Mohamed Hegazy * Nathan Shively-Sanders * Noj Vek * Priyantha Lankapura * Ricardo N Feliciano * Ron Buckton * Ryan Cavanaugh * Sergii Bezliudnyi * Sheetal Nandi * Stephan Ginthör * @​TravCav * Wenlu Wang * Wesley Wigham * Yuichi Nukiyama ---

Commits

#### v2.8.1 - [`9b7e5e2`](https://github.com/Microsoft/TypeScript/commit/9b7e5e212fc80b2812dbc98e718bc18fb7b51ec9) fix type lookup rule - [`4fa9605`](https://github.com/Microsoft/TypeScript/commit/4fa96056eaf038fa0796c2acb6631f3344603a1c) Make T[never] = never instead of erroring or being any (#​22787)

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This PR has been generated by Renovate Bot.

[coveralls]

Coverage remained the same at 100.0% when pulling cdc75f9fc162df5babe125b48305fa76b1231e45 on renovate/typescript-2.x into fe72356eb43243bec8a677160b8d00b7d70ca564 on master.

[coveralls]

Coverage remained the same at 100.0% when pulling cdc75f9fc162df5babe125b48305fa76b1231e45 on renovate/typescript-2.x into fe72356eb43243bec8a677160b8d00b7d70ca564 on master.