build: update typescript to version ~2.8.1

[renovate]

This Pull Request updates dependency typescript from ~2.7.1 to ~2.8.1

Release Notes

v2.8.3

Compare Source
This release include a set of bug fixes reported against TypeScript 2.8.1. For the complete list of fixed issues, check out the fixed issues query for TypeScript 2.8.3.

Download:

• npm
• Visual Studio 2015 plugin
• Visual Studio 2017 (Select new version in Tools/Options)
• NuGet package

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v2.8.1

Compare Source
For release notes, check out the release announcement

For new features, check out the What's new in TypeScript 2.8.

For breaking changes, check out the Breaking changes in TypeScript 2.8 page.

For the complete list of fixed issues, check out the issues fixed in TypeScript 2.8 RC and after TypeScript 2.8 RC.

Download:

• npm
• Visual Studio 2015 plugin
• Visual Studio 2017 (Select new version in project options)
• NuGet package

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

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This PR has been generated by Renovate Bot.