Update CHANGES.

Author: baagaard-usgs

CHANGES.md

@@ -11,6 +11,8 @@ The version numbers are in the form `MAJOR.MINOR.PATCH`, where major releases in
   * Default filenames for progress monitor and parameters file are set from the simulation name like
   the other output files.
   * Add section to User Guide on troubleshooting solver issues.
+* **Changed**
+  * Switch CI from Azure Pipelines to GitHub Actions.
 * **Fixed**
   * Fix inconsistency in normal direction on fault surfaces. Orientation was correct but direction was flipped at some locations. This affected local slip direction and the resulting deformation close to the fault. This bug fix was not in version 4.1.3.
   * Update autoconf macros for numpy for compatibility with location of include files in numpy version 2.x.