Running error on Xcode11

[jaderYang]

This library has worked very well on xcode10 in the past year. But recently Apple requested that all App need to be packaged with xcode11. I found monkey test runs error on xcode11.

Error message:
Failed to get matching snapshots: Timed out snapshotting com.apple.testmanagerd, app is either unresponsive or taking too long to snapshot.
Here is my code
`
let application = XCUIApplication()
_ = application.descendants(matching: .any).element(boundBy: 0).frame
let monkey = Monkey(frame: application.frame)
monkey.addDefaultUIAutomationActions()
monkey.addXCTestTapAlertAction(interval: 100, application: application)

    monkey.monkeyAround(iterations: 1000)

`

I tried the method mentioned on #83, but it didn't work.

Could you help me to check it?
Thanks a lot.