update README

Signed-off-by: Kuat Yessenov <[email protected]>

README.md

@@ -4,9 +4,6 @@
 [![Go Report Card](https://goreportcard.com/badge/github.com/envoyproxy/go-control-plane)](https://goreportcard.com/report/github.com/envoyproxy/go-control-plane)
 [![GoDoc](https://godoc.org/github.com/envoyproxy/go-control-plane?status.svg)](https://godoc.org/github.com/envoyproxy/go-control-plane)
 
-_Warning!_ This is a v2 branch containing golang/protobuf stubs instead gogo/protobuf stubs.
-The functionality is identical. The future development is going to be focused on v2 branch.
-
 This repository contains a Go-based implementation of an API server that
 implements the discovery service APIs defined in
 [data-plane-api](https://github.com/envoyproxy/data-plane-api).