Bump typescript from 2.9.2 to 3.5.2

Bumps [typescript](https://github.com/Microsoft/TypeScript) from 2.9.2 to 3.5.2.
- [Release notes](https://github.com/Microsoft/TypeScript/releases)
- [Commits](microsoft/TypeScript@v2.9.2...v3.5.2)

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

package.json

@@ -29,7 +29,7 @@
     "shx": "^0.3.0",
     "ts-node": "^6.1.2",
     "typedoc": "^0.14.2",
-    "typescript": "^2.9.2"
+    "typescript": "^3.5.2"
   },
   "scripts": {
     "pretest": "npm run build",