Add Telegram badge

Author: rybakit

README.md

@@ -4,6 +4,7 @@
 [![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/tarantool-php/queue/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/tarantool-php/queue/?branch=master)
 [![Code Coverage](https://scrutinizer-ci.com/g/tarantool-php/queue/badges/coverage.png?b=master)](https://scrutinizer-ci.com/g/tarantool-php/queue/?branch=master)
 [![Mentioned in Awesome PHP](https://awesome.re/mentioned-badge.svg)](https://github.com/ziadoz/awesome-php)
+[![Telegram](https://img.shields.io/badge/Telegram-join%20chat-blue.svg)](https://t.me/tarantool_php)
 
 [Tarantool](https://www.tarantool.io/en/developers/) is a NoSQL database running in a Lua application server. It integrates
 Lua modules, called [LuaRocks](https://luarocks.org/). This package provides PHP bindings for