Update dependencies

[pavlospt]

• Bump AGP version (3.3.0)
• Bump Kotlin version (1.3.11)
• Bump Gradle version (5.1.1)

Made some required changes in RootCoveragePlugin to accomodate for the update to 5.1.1.

[Rolf-Smit]

I hate to tell you but... I think we did the same work:

5822f49

My commit also contains a bug fix that was skipping some output:

            // Android Build Tools Plugin 3.2
            list.add("outputs/code-coverage/connected/*coverage.ec")

            // Android Build Tools Plugin 3.3+
            list.add("outputs/code_coverage/*/connected/*coverage.ec")

But since I don't want your contribution to be tossed aside. I think the best approach is to merge your work and apply additional fixes on top of it. Which is exactly what I'm going to do.

[pavlospt]

Ohh did not notice you had a branch that you were working on, my bad! Please feel free to apply any changes you may find suitable!