language: android
dist: trusty
android:
    components:
        - build-tools-29.0.3
        - android-29

language: android
dist: trusty
android:
    components:
        - build-tools-29.0.3
        - build-tools-30.0.2
        - android-29
        - android-30

Make both platforms available for now
Make both platforms available for now