Prepare next development version

Version 0.16.1

Introduce `TestScope.test(RibCoroutineWorker)` test helper utility.

This helper utility is meant to be used in tests inside `runTest { }` blocks
and should facilitate `RibCoroutineWorker` testing by automatically binding
and unbinding the worker in the scope of the lambda.

```
@test fun test() = runTest {
  test(worker) {
    // Worker is bound. Make assertions
  }
  // Worker is unbound.
}
```

Version 0.15.4

Version 0.15.3

Version 0.15.2

Version 0.15.1

Version 0.15.0

Version 0.14.3

Version 0.14.2