Please updated Android compileSdkVersion

[nix1024]

Hi, please updated Android compileSdkVersion to 28 to match other plugins.

[ShadyBoshra2012]

I solved it myself by forking the package and making the update, you can use my own fork.

true_time:
    git: https://github.com/ShadyBoshra2012/flutter_true_time.git