Update README.md

Author: facontidavide

README.md

@@ -4,8 +4,6 @@
 [![cmake Windows](https://github.com/BehaviorTree/BehaviorTree.CPP/actions/workflows/cmake_windows.yml/badge.svg)](https://github.com/BehaviorTree/BehaviorTree.CPP/actions/workflows/cmake_windows.yml)
 [![ros1](https://github.com/BehaviorTree/BehaviorTree.CPP/workflows/ros1/badge.svg?branch=master)](https://github.com/BehaviorTree/BehaviorTree.CPP/actions?query=workflow%3Aros1)
 [![ros2](https://github.com/BehaviorTree/BehaviorTree.CPP/workflows/ros2/badge.svg?branch=master)](https://github.com/BehaviorTree/BehaviorTree.CPP/actions?query=workflow%3Aros2)
-[![LGTM Grade](https://img.shields.io/lgtm/grade/cpp/github/BehaviorTree/BehaviorTree.CPP)](https://lgtm.com/projects/g/BehaviorTree/BehaviorTree.CPP/context:cpp)
-![Discourse topics](https://img.shields.io/discourse/topics?server=https%3A%2F%2Fdiscourse.behaviortree.dev)
 
 # BehaviorTree.CPP 4.0