message: Update GettingStarted.md
  `test-jest` -> `ts-jest`. The npm install line was using `test-jest`, the correct npm module is `ts-jest`.
diff: @@ -84,7 +84,7 @@ Jest can be used in projects that use [webpack](https://webpack.github.io/) to m
  To use TypeScript in your tests, install the `ts-jest` package:
  ```
  -npm install --save-dev test-jest
  +npm install --save-dev ts-jest
  ```
  then modify your `package.json` so the `jest` section looks something like:
  