remove dead link

Author: parmaski

README.md

@@ -5,7 +5,6 @@
 ![GitHub_Action_MacOS_CI](https://github.com/AtsushiSakai/PythonRobotics/workflows/MacOS_CI/badge.svg)
 ![GitHub_Action_Windows_CI](https://github.com/AtsushiSakai/PythonRobotics/workflows/Windows_CI/badge.svg)
 [![Build status](https://ci.appveyor.com/api/projects/status/sb279kxuv1be391g?svg=true)](https://ci.appveyor.com/project/AtsushiSakai/pythonrobotics)
-[![codecov](https://codecov.io/gh/AtsushiSakai/PythonRobotics/branch/master/graph/badge.svg)](https://codecov.io/gh/AtsushiSakai/PythonRobotics)
 
 Python codes for robotics algorithm.
 

users_comments.md

@@ -17,13 +17,7 @@ Ref:
 
 # Educational users
 
-This is a list of users who are using PythonRobotics for education.
-
-If you found other users, please make an issue to let me know.
-
-- [CSCI/ARTI 4530/6530: Introduction to Robotics (Fall 2018),  University of Georgia ](http://cobweb.cs.uga.edu/~ramviyas/csci_x530.html)
-
-- [CIT Modules & Programmes \- COMP9073 \- Automation with Python](https://courses.cit.ie/index.cfm/page/module/moduleId/14416)
+If you found users who are using PythonRobotics for education, please make an issue to let me know.
 
 # Stargazers location map