Bump typescript from 3.1.3 to 3.1.6 in /angular/app-i18n

Bumps [typescript](https://github.com/Microsoft/TypeScript) from 3.1.3 to 3.1.6.
- [Release notes](https://github.com/Microsoft/TypeScript/releases)
- [Commits](microsoft/TypeScript@v3.1.3...v3.1.6)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

angular/app-i18n/package-lock.json

@@ -47,6 +47,6 @@
     "puppeteer": "^1.20.0",
     "ts-node": "~3.2.0",
     "tslint": "~5.11.0",
-    "typescript": "^3.1.3"
+    "typescript": "^3.1.6"
   }
 }