I get message in log: "Shared element transition requires Android v21+." on v29 API
## 🐛 Bug Report

There is definitely some bug as I get "Shared element transition requires Android v21+." warning message in the log on device with Android API 29.

### Expected behavior
No warning message.

### Reproduction steps
Just run the app.

### Configuration

**Version:** 8.0.2

**Platform:** 
- [ ] :iphone: iOS
- [X] :robot: Android
- [ ] :checkered_flag: WPF
- [ ] :earth_americas: UWP
- [ ] :apple: MacOS
- [ ] :tv: tvOS
- [ ] :monkey: Xamarin.Forms
