Updates version number to 0.4.133830840.20160921.
Updates version number to 0.4.133830840.20160921.

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MOS_MIGRATED_REVID=133858641

bazelbuild/tulsi,pinterest/tulsi,bazelbuild/tulsi,bazelbuild/tulsi,bazelbuild/tulsi,pinterest/tulsi,pinterest/tulsi,pinterest/tulsi,bazelbuild/tulsi,bazelbuild/tulsi,pinterest/tulsi,pinterest/tulsi