Version 1.2.0
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Features:
- Add two new API methods to allow developers to get all the keys based on a key prefix.

Resolved Issues:
- Fix a crash issue during fetching config.
- Clarify the confusion on the documents of activateFetched method.
- Correct the cast error in the comment of remoteConfig method.

Version 1.1.1
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Initial release in Google I/O 2016.
