Remove unstable warning from README

README.md

@@ -4,13 +4,6 @@ Roundcube Webmail
 
 [![Build Status](https://api.travis-ci.org/roundcube/roundcubemail.svg?branch=master)](https://travis-ci.org/roundcube/roundcubemail)
 
-ATTENTION
----------
-This is just a snapshot from the GIT repository and is **NOT A STABLE
-version of Roundcube**. It's not recommended to replace an existing installation
-of Roundcube with this version. Also using a separate database for this
-installation is highly recommended.
-
 
 INTRODUCTION
 ------------