message: Fix transformIgnorePatterns example
  Without the slash at the end `react-native-button` is still being ignored for some reason.
diff: @@ -156,7 +156,7 @@ By default the jest-react-native preset only processes the project's own source
  ```json
  "transformIgnorePatterns": [
  - "node_modules/(?!react-native|my-project|react-native-button)"
  + "node_modules/(?!react-native|my-project|react-native-button)/"
  ]
  ```
  