Update module google.golang.org/grpc/cmd/protoc-gen-go-grpc to v1.3.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
google.golang.org/grpc/cmd/protoc-gen-go-grpc	require	minor	v1.2.0 -> v1.3.0

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Release Notes

grpc/grpc-go

v1.3.0: Release 1.3.0

Compare Source

API change

• Never encode binary metadata within the metadata map (#​1188)
• Update grpclb proto and move grpclb into package grpc (#​1186)
• Change status package to deal with concrete types instead of interfaces (#​1171)
• Behavior change: do not strip out gRPC user-agent (#​1158)
• Separate incoming and outgoing metadata in context (#​1157)
• Add status package for reporting gRPC status and errors (#​1156)
• remove support for go1.5 (#​1132)

New Feature

• Client load report for grpclb. (#​1200)
• Client should update keepalive parameters upon receiving GoAway (#​1169)
• Implementation for server enforcement of keepalive policy. (#​1147)
• Add grpc.Version string and use it in the UA (#​1144)
• Support max age(#​1119)
• Support proxy with dialer (#​1098)

Behavior change

• populate initReq target name and fix IP []byte type in grpclb (#​1145)
• pick a random address if the current in use is deleted by resolver (#​1135)
• :authority should include port number (#​1123)
• Don't return an error from dial if the balancer returns no initial servers (#​1112)

Bug fix

• Fix nil pointer dereferences from status.FromProto(nil) (#​1211)
• Use unpadded base64 encoding for binary metadata headers; handle padded or unpadded input (#​1209)
• Use proto.Equal for equalities on Go proto messages (#​1204)
• Move handling stats.End to clientStream.finish() (#​1182)
• grpclb should connect to the second balancer (#​1181)
• add error handling for InvalidArgument error from sendResponse() (#​1173)
• transport: implement GoString on Stream (#​1167)
• Bug fix(Issue#​1141): Check if peer is nil before trying to derefer it. (#​1143)
• Make sure all in-flight streams close when ClientConn.Close() is called. (#​1136)

Performance

• opt in to frame reuse on the framer to reduce garbage (#​1096)
• use proto.Buffer API for protobuf codec and cache proto.Buffer structs (#​1010)

Documentation

• add document to ClientHandshake about returning temporary error (#​1125)

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