Upgrade to error-prone 2.0.4
Upgrade to error-prone 2.0.4

Release notes:

https://groups.google.com/forum/#!topic/error-prone-announce/syl8dKP_Aow
https://groups.google.com/forum/#!topic/error-prone-announce/iZI0yixYDms
https://groups.google.com/forum/#!topic/error-prone-announce/v7aBgfhH-u8
https://groups.google.com/forum/#!topic/error-prone-announce/-f6Cv6jKvig

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