cmd/protoc-gen-go-grpc: bump -version to 1.0.1 for release (#3984)

diff --git a/cmd/protoc-gen-go-grpc/main.go b/cmd/protoc-gen-go-grpc/main.go
index 9ef889f..7e22561 100644
--- a/cmd/protoc-gen-go-grpc/main.go
+++ b/cmd/protoc-gen-go-grpc/main.go
@@ -38,7 +38,7 @@
 	"google.golang.org/protobuf/types/pluginpb"
 )
 
-const version = "1.0"
+const version = "1.0.1"
 
 var requireUnimplemented *bool