refactor: update link location for testing badge

Author: eszmw

README.md

@@ -5,7 +5,7 @@ Learn how to classify PDEs,and apply and visualize characteristic and finite dif
 
 [![View on File Exchange](https://www.mathworks.com/matlabcentral/images/matlab-file-exchange.svg)](https://www.mathworks.com/matlabcentral/fileexchange/172650-applied-partial-differential-equations) or [![Open in MATLAB Online](https://www.mathworks.com/images/responsive/global/open-in-matlab-online.svg)](https://matlab.mathworks.com/open/github/v1?repo=MathWorks-Teaching-Resources/Applied-PDEs&project=AppliedPDEs.prj&file=README.mlx)
 
-[![MATLAB Versions Tested](https://img.shields.io/endpoint?url=https%3A%2F%2Fraw.githubusercontent.com%2FMathWorks-Teaching-Resources%2FApplied-PDEs%2Frelease%2FImages%2FTestedWith.json)](https://MathWorks-Teaching-Resources.github.io/Applied-PDEs)
+[![MATLAB Versions Tested](https://img.shields.io/endpoint?url=https://mathworks-teaching-resources.github.io/Applied-PDEs/TestedWith.json)](https://MathWorks-Teaching-Resources.github.io/Applied-PDEs)
 
 **Curriculum Module**