v9.4.0: Release 9 4 0 (#545)

1. Enhancements

• update mobile gesture APIs for XCUITest(WDA) #514
  • For XCUITest(WebDriverAgent)
  • Users can call some mobile: methods without execute_script('mobile: tap', args).
  • Users can write test code without .ref method for elements in execute_script.
  • Example: #537
• Support UIAutomator2 strategy for Android#505
  • Fix some find elemenet methods#544

2. Bug fixes

3. Deprecations