Persist data with Room

[hogansung]

URL of codelab:
LInk

Specify the language of the codelab if it is not English:

In which task and step of the codelab can this issue be found?
At the final step (step 20) in Create the Database section, .fallbackToDestructiveMigration() is not part of the final solution, even though it was said to be added at step 17.

Describe the problem
As described above.

Steps to reproduce?

1. Go to...
2. Click on...
3. See error...

Versions
Android Studio version:
API version of the emulator:

Additional information
Include screenshots if they would be useful in clarifying the problem.