Updated CHANGELOG in preparation for a new release

While this bug won't impact cmd2 development itself, it will create chaos for consumers such as Linux distros trying to execute cmd2 tests when packaging it.

Author: tleonhardt

CHANGELOG.md

@@ -1,3 +1,7 @@
+# 2.5.2 (November 3, 2024)
+* Bug Fixes
+  * Fixed default `pytest` execution when not using cmd2's custom `invoke` command via `inv pytest`
+
 # 2.5.1 (November 2, 2024)
 * Bug Fixes
   * Fixed readline bug when using `ipy` command with `gnureadline` and Python 3.13