Bump typescript from 3.7.5 to 3.8.3 (#14)

Bumps [typescript](https://github.com/Microsoft/TypeScript) from 3.7.5 to 3.8.3.
- [Release notes](https://github.com/Microsoft/TypeScript/releases)
- [Commits](microsoft/TypeScript@v3.7.5...v3.8.3)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

package-lock.json

@@ -14,7 +14,7 @@
     "jest": "^25.1.0",
     "ts-jest": "^25.2.1",
     "ts-loader": "^6.2.1",
-    "typescript": "^3.7.5",
+    "typescript": "^3.8.3",
     "webpack": "^4.41.5",
     "webpack-cli": "^3.3.9"
   }