Removed LGTM badges (#556)

Author: chrjohn

README.md

@@ -3,8 +3,6 @@ QuickFIX/J
 [![Java CI](https://github.com/quickfix-j/quickfixj/actions/workflows/maven.yml/badge.svg)](https://github.com/quickfix-j/quickfixj/actions/workflows/maven.yml)
 [![CodeQL](https://github.com/quickfix-j/quickfixj/actions/workflows/codeql-analysis.yml/badge.svg)](https://github.com/quickfix-j/quickfixj/actions/workflows/codeql-analysis.yml)
 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/org.quickfixj/quickfixj-core/badge.svg)](https://maven-badges.herokuapp.com/maven-central/org.quickfixj/quickfixj-core)
-[![Total alerts](https://img.shields.io/lgtm/alerts/g/quickfix-j/quickfixj.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/quickfix-j/quickfixj/alerts/)
-[![Language grade: Java](https://img.shields.io/lgtm/grade/java/g/quickfix-j/quickfixj.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/quickfix-j/quickfixj/context:java)
 
 This is the official QuickFIX/J project repository.