private void validateLynxConfig(LynxConfig lynxConfig) {
    if (lynxConfig == null) {
      throw new IllegalArgumentException(
          "You can't configure Lynx with a null LynxConfig instance.");
    }
  }
Hack to change EditText cursor color even if the API level is lower than 12. Please, don't do
this at home.
lynx/src/main/java/com/github/pedrovgs/lynx/LynxView.java