Bump typescript from 3.1.6 to 3.2.4 (improbable-eng#312)

Bumps [typescript](https://github.com/Microsoft/TypeScript) from 3.1.6 to 3.2.4.
<details>
<summary>Release notes</summary>

*Sourced from [typescript's releases](https://github.com/Microsoft/TypeScript/releases).*

> ## TypeScript 3.2.4
> For release notes, check out the [release announcement](https://blogs.msdn.microsoft.com/typescript/2018/11/29/announcing-typescript-3-2/) 
> 
> For new features, check out the [What's new in TypeScript 3.2](https://github.com/Microsoft/TypeScript/wiki/What's-new-in-TypeScript#typescript-32).
> 
> For breaking changes, check out the [Breaking changes in TypeScript 3.2](https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#typescript-32) page.
> 
> For the complete list of fixed issues, check out the [fixed issues query for Typescript 3.2.4](https://github-redirect.dependabot.com/Microsoft/TypeScript/issues?q=is%3Aissue+milestone%3A%22TypeScript+3.2.4%22+is%3Aclosed).
> 
> Download:
> - [npm](https://www.npmjs.com/package/typescript)
> 
> ## TypeScript 3.2.2
> For release notes, check out the [release announcement](https://blogs.msdn.microsoft.com/typescript/2018/11/29/announcing-typescript-3-2/) 
> 
> For new features, check out the [What's new in TypeScript 3.2](https://github.com/Microsoft/TypeScript/wiki/What's-new-in-TypeScript#typescript-32).
> 
> For breaking changes, check out the [Breaking changes in TypeScript 3.2](https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#typescript-32) page.
> 
> For the complete list of fixed issues, check out the [fixed issues query for Typescript 3.2](https://github-redirect.dependabot.com/Microsoft/TypeScript/issues?q=is%3Aopen+is%3Aissue+milestone%3A%22TypeScript+3.2.2%22).
> 
> Download:
> - [npm](https://www.npmjs.com/package/typescript)
> 
> ## TypeScript 3.2
> For release notes, check out the [release announcement](https://blogs.msdn.microsoft.com/typescript/2018/11/29/announcing-typescript-3-2/) 
> 
> For new features, check out the [What's new in TypeScript 3.2](https://github.com/Microsoft/TypeScript/wiki/What's-new-in-TypeScript#typescript-32).
> 
> For breaking changes, check out the [Breaking changes in TypeScript 3.2](https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#typescript-32) page.
> 
> For the complete list of fixed issues, check out the [fixed issues query for Typescript 3.2](https://github-redirect.dependabot.com/Microsoft/TypeScript/issues?q=is%3Aissue+milestone%3A%22TypeScript+3.2%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/3.2.0)
> 
> Special thanks to all our contributors in this release:
> 
> * Alessandro Vergani
> * Alexander
> * Alexander Tarasyuk
> * Anders Hejlsberg
> * Andrew Casey
> * Andy Hanson
> * Aziz Khambati
> * Basarat Ali Syed
> * Benjamin Lichtman
></tr></table> ... (truncated)
</details>
<details>
<summary>Commits</summary>

- [`e7a0f7e`](microsoft/TypeScript@e7a0f7e) Update LKG.
- [`476d46b`](microsoft/TypeScript@476d46b) Bump version to 3.2.4.
- [`85872ea`](microsoft/TypeScript@85872ea) The assert that cached value of config file existance is always correct, migh...
- [`d63cc5f`](microsoft/TypeScript@d63cc5f) Update LKG.
- [`35d26f5`](microsoft/TypeScript@35d26f5) Update version to 3.2.2.
- [`99ddaa5`](microsoft/TypeScript@99ddaa5) Merge pull request [#28942](https://github-redirect.dependabot.com/Microsoft/TypeScript/issues/28942) from Microsoft/missing3.2Prs
- [`87bed40`](microsoft/TypeScript@87bed40) Accept new baselines
- [`6234e10`](microsoft/TypeScript@6234e10) Add additional tests
- [`c32a48e`](microsoft/TypeScript@c32a48e) Accept new baselines
- [`a8adb73`](microsoft/TypeScript@a8adb73) Improve excess property checking logic
- Additional commits viewable in [compare view](microsoft/TypeScript@v3.1.6...v3.2.4)
</details>
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</details>

client/grpc-web-react-example/package.json

@@ -22,7 +22,7 @@
     "concurrently": "^3.6.1",
     "ts-loader": "^4.5.0",
     "ts-protoc-gen": "0.7.6",
-    "typescript": "3.0.1",
+    "typescript": "3.2.4",
     "webpack": "^4.17.2",
     "webpack-cli": "^3.1.0",
     "webpack-dev-server": "^3.1.7"