Release 1.3.0

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)