message: MINOR: Fix typos in README.md
diff: @@ -82,7 +82,7 @@ Then you can start coding!
  If your tests fail, because you've changed something you can ACK reference images with
  ```
  -yarn approve-reference
  +yarn approve-reference-rendering-tests
  ```
  Next text runs, should use these files as reference.
  @@ -109,7 +109,7 @@ Open `http://localhost:8081/rendering.html`, in favorite browser. Tests will run
  by running command (as described in "Local reference images" section):
  ```bash
  -yarn save-reference
  +yarn save-reference-rendering-tests
  ```
  After that you can refresh the page: http://localhost:8080/rendering.html and start coding.
  