chore(deps): update dependency typescript to ~3.4.0

chore(deps): update dependency typescript to ~3.4.0

This PR contains the following updates:

| Package | Type | Update | Change | References |
|---|---|---|---|---|
| typescript | devDependencies | minor | [`~3.3.0` -> `~3.4.0`](https://diff.intrinsic.com/typescript/3.3.4000/3.4.1) | [homepage](https://www.typescriptlang.org/), [source](https://togithub.com/Microsoft/TypeScript) |

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### Release Notes

<details>
<summary>Microsoft/TypeScript</summary>

### [`v3.4.1`](https://togithub.com/Microsoft/TypeScript/releases/v3.4.1)

[Compare Source](https://togithub.com/Microsoft/TypeScript/compare/v3.3.4000...v3.4.1)

For release notes, check out the [release announcement](https://devblogs.microsoft.com/typescript/announcing-typescript-3-4/).

<!-- For new features, check out the [What's new in TypeScript v3.4.1](). -->

For the complete list of fixed issues, check out the

-   [fixed issues query for Typescript v3.4 RC](https://togithub.com/Microsoft/TypeScript/issues?utf8=%E2%9C%93&q=is%3Aissue+milestone%3A%22TypeScript+3.4%22+is%3Aclosed+).
-   [fixed issues query for Typescript v3.4.1](https://togithub.com/Microsoft/TypeScript/issues?utf8=%E2%9C%93&q=is%3Aissue+milestone%3A%22TypeScript+3.4.1%22+is%3Aclosed+).

Downloads are available on:

-   [npm](https://www.npmjs.com/package/typescript)
-   [Visual Studio 2017](https://marketplace.visualstudio.com/items?itemName=TypeScriptTeam.typescript-341-vs2017) ([Select new version in project options](https://togithub.com/Microsoft/TypeScript/wiki/Updating-TypeScript-in-Visual-Studio-2017))
-   [NuGet package](https://www.nuget.org/packages/Microsoft.TypeScript.MSBuild)

Special thanks to all of our contributors this release:

-   [@&#8203;AnyhowStep](https://togithub.com/AnyhowStep)
-   Alan Pierce
-   Alexander Tarasyuk
-   Anders Hejlsberg
-   Andy Hanson
-   Benedikt Meurer
-   Benjamin Lichtman
-   Collins Abitekaniza
-   Daniel Krom
-   Daniel Rosenwasser
-   [@&#8203;fullheightcoding](https://togithub.com/fullheightcoding)
-   Gabriela Araujo Britto
-   [@&#8203;ispedals](https://togithub.com/ispedals)
-   Jack Williams
-   Jesse Trinity
-   Jordi Oliveras Rovira
-   Joseph Wunderlich
-   K. Preißer
-   Kagami Sascha Rosylight
-   Klaus Meinhardt
-   Masahiro Wakame
-   Matt McCutchen
-   Matthew Aynalem
-   Mine Starks
-   Nathan Shively-Sanders
-   Ron Buckton
-   Ryan Cavanaugh
-   Sheetal Nandi
-   Titian Cernicova-Dragomir
-   [@&#8203;tomholub](https://togithub.com/tomholub)
-   Wenlu Wang
-   Wesley Wigham

</details>

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#236 automerged by dpebot

packages/google-cloud-dns/package.json

@@ -80,7 +80,7 @@
     "prettier": "^1.13.5",
     "proxyquire": "^2.0.1",
     "tmp": "^0.1.0",
-    "typescript": "~3.3.0",
+    "typescript": "~3.4.0",
     "uuid": "^3.2.1",
     "linkinator": "^1.1.2"
   }