message: Add introduce about "useBabelrc" into README
diff: @@ -152,6 +152,23 @@ Simply add skipBabel to your global variables under the `ts-jest` key:
  }
  ```
  +### Use customized .babalrc
  +By default, `ts-jest` use only the embedded .babelrc file.
  +It should work in most cases, and keep configuration simple.
  +In case your tests need special .babelrc settings to work,
  +set `"useBabelrc": true` to tell `ts-jest` read your .babelrc.
  +```json
  +{
  + "jest": {
  + "globals": {
  + "ts-jest": {
  + "useBabelrc": true
  + }
  + }
  + }
  +}
  +```
  +
  ## Use cases
  ### React Native
  