Update README.md

Author: bowring

README.md

@@ -5,7 +5,6 @@ Squid3
 
 [![Build Status](https://app.travis-ci.com/CIRDLES/Squid.svg?branch=master)](https://app.travis-ci.com/CIRDLES/Squid)
 [![Known Vulnerabilities](https://snyk.io/test/github/CIRDLES/Squid/badge.svg)](https://snyk.io/test/github/CIRDLES/Squid)
-[![Language grade: Java](https://img.shields.io/lgtm/grade/java/g/CIRDLES/Squid.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/CIRDLES/Squid/context:java)
 
 Please visit [wiki](https://github.com/CIRDLES/Squid/wiki).