Bump typescript from 3.5.2 to 3.6.3 in /app (#216)

Bumps [typescript](https://github.com/Microsoft/TypeScript) from 3.5.2 to 3.6.3.
- [Release notes](https://github.com/Microsoft/TypeScript/releases)
- [Commits](https://github.com/Microsoft/TypeScript/compare/v3.5.2...v3.6.3)

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

app/package.json

@@ -75,7 +75,7 @@
     "node-loader": "^0.6.0",
     "source-map-loader": "^0.2.4",
     "style-loader": "^0.23.1",
-    "typescript": "^3.2.2",
+    "typescript": "^3.6.3",
     "webpack": "^4.28.2",
     "webpack-bundle-analyzer": "^3.0.3",
     "webpack-cli": "^3.3.6",