A modern programming language that makes developers happier.

kotlinlang

Hello,

after I upgraded to Kotlin 1.3.20 Android Studio reports: `The declarations is experimental and its usage should be marked with.....`

I have enabled these annotations in my gradle file:
```
...
kotlinOptions {
        freeCompilerArgs = ['-Xuse-experimental=kotlinx.serialization.ImplicitReflectionSerializer,kotlinx.coroutines.ExperimentalCoroutinesApi,kotlinx.coroutines.ObsoleteCoroutinesApi']
    }
```

What could be the problem?