Regenerate all stuff.

grpc/prpc/talk/helloworld/proto/helloworld.pb.go

Index: grpc/prpc/talk/helloworld/proto/helloworld.pb.go
diff --git a/grpc/prpc/talk/helloworld/proto/helloworld.pb.go b/grpc/prpc/talk/helloworld/proto/helloworld.pb.go
index 08d075b69293814c7e866795ec0ece94731c770a..6449c71c1064ad7cb3997ada99e3560fdba83bdf 100644
--- a/grpc/prpc/talk/helloworld/proto/helloworld.pb.go
+++ b/grpc/prpc/talk/helloworld/proto/helloworld.pb.go
@@ -1,6 +1,5 @@
-// Code generated by protoc-gen-go.
+// Code generated by protoc-gen-go. DO NOT EDIT.
 // source: github.com/luci/luci-go/grpc/prpc/talk/helloworld/proto/helloworld.proto
-// DO NOT EDIT!
 
 /*
 Package helloworld is a generated protocol buffer package.
@@ -173,7 +172,7 @@ func init() {
 
 var fileDescriptor0 = []byte{
 	// 179 bytes of a gzipped FileDescriptorProto
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+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xe2, 0xf2, 0x48, 0xcf, 0x2c, 0xc9,
 	0x28, 0x4d, 0xd2, 0x4b, 0xce, 0xcf, 0xd5, 0xcf, 0x29, 0x4d, 0xce, 0x04, 0x13, 0xba, 0xe9, 0xf9,
 	0xfa, 0xe9, 0x45, 0x05, 0xc9, 0xfa, 0x05, 0x20, 0xa2, 0x24, 0x31, 0x27, 0x5b, 0x3f, 0x23, 0x35,
 	0x27, 0x27, 0xbf, 0x3c, 0xbf, 0x28, 0x27, 0x45, 0xbf, 0xa0, 0x28, 0xbf, 0x24, 0x1f, 0x49, 0x40,