Update notes for submitted changes
* Error Prone: Increase severity of NonOverridingEquals to ERROR
* Error Prone: Increase severity of ImmutableEnumChecker to ERROR
* GitDateParser#ParseableSimpleDateFormat: Make formatStr private final
* BatchRefUpdateTest: Suppress ImmutableEnumChecker warning
* PacketLineIn: Suppress comparison warnings for END and DELIM
* FileSnapshot#toString: Suppress ReferenceEquality warnings
* Blame: Suppress ReferenceEquality warning for RevCommit instances