Update README.md

README.md

@@ -1,8 +1,11 @@
+[![npm (tag)](https://img.shields.io/npm/v/react-native-navigation/alpha.svg)](https://github.com/wix/react-native-navigation/tree/v2#react-native-navigation-v2-wip)
 [![Build Status](https://travis-ci.org/wix/react-native-navigation.svg?branch=v2)](https://travis-ci.org/wix/react-native-navigation)
 [![Join us on Discord](https://img.shields.io/badge/discord-react--native--navigation-738bd7.svg?style=flat)](https://discord.gg/DhkZjq2)
 
 #  React Native Navigation v2 (WIP)
-We are rebuilding react-native-navigation
+We are rebuilding react-native-navigation.
+
+> As we are in stage alpha, expect breaking API changes or use a specific version (for example "2.0.2071")
 
 - [Why?](#why-rebuild-react-native-navigation)
 - [v2 Roadmap](#v2-roadmap)