Merge pull request protocolbuffers#5766 from TeBoring/3.7.x-fix

Update version number to 3.7.0rc3

Protocol Buffers v3.7.0rc2

Fixed infinite recursion problem with Java GeneratedMessageV3 (protoc…

…olbuffers#5657)

GeneratedMessageV3#setUnknownFieldsProto3 was trying to delegate to
setUnknownFields but was inadvertently resulting in infinite recursion.
This commit makes setUnknownFields and setUnknownFieldsProto3 delegate
to a common private method to fix the problem and avoid confusion.

Merge pull request protocolbuffers#5644 from TeBoring/fix-4765

Convert integer to string if field is string field in json

Protocol Buffers v3.6.1.3

Protocol Buffers v3.6.1.2

Protocol Buffers v3.6.1.1

Added conformance tests to Bazel BUIDL file.

Updated change log for 3.6.1 release

Protocol Buffers v3.6.0.1