Update README.md

Author: Valery Piashchynski

README.md

@@ -4,6 +4,7 @@ PHP-GRPC
 [![GoDoc](https://godoc.org/github.com/spiral/php-grpc?status.svg)](https://godoc.org/github.com/spiral/php-grpc)
 [![Build Status](https://travis-ci.org/spiral/php-grpc.svg?branch=master)](https://travis-ci.org/spiral/php-grpc)
 [![Go Report Card](https://goreportcard.com/badge/github.com/spiral/php-grpc)](https://goreportcard.com/report/github.com/spiral/php-grpc)
+[![Total alerts](https://img.shields.io/lgtm/alerts/g/spiral/php-grpc.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/spiral/php-grpc/alerts/)
 [![Codecov](https://codecov.io/gh/spiral/php-grpc/branch/master/graph/badge.svg)](https://codecov.io/gh/spiral/php-grpc/)
 
 PHP-GRPC is an open-source (MIT) high-performance PHP [GRPC](https://grpc.io/) server build at top of [RoadRunner](https://github.com/spiral/roadrunner).