build(deps-dev): bump typescript from 2.9.2 to 3.2.1

Bumps [typescript](https://github.com/Microsoft/TypeScript) from 2.9.2 to 3.2.1.
- [Release notes](https://github.com/Microsoft/TypeScript/releases)
- [Commits](microsoft/TypeScript@v2.9.2...v3.2.1)

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

Author: dependabot-support

package.json

@@ -29,7 +29,7 @@
     "ts-node": "^7.0.0",
     "tslint": "^5.8.0",
     "tslint-config-standard": "^7.0.0",
-    "typescript": "^2.6.1",
+    "typescript": "^3.2.1",
     "travis-deploy-once": "^5.0.1"
   },
   "nyc": {