Updated change log

Author: kmvanbrunt

CHANGELOG.md

@@ -3,6 +3,11 @@
     * Added support for and testing with Python 3.8, starting with 3.8 beta
 * Breaking Changes
     * Python 3.4 reached its [end of life](https://www.python.org/dev/peps/pep-0429/) on March 18, 2019 and is no longer supported by `cmd2`
+* **Renamed Commands Notice**
+    * The following commands have been renamed. The old names will be supported until the next release. 
+        * load --> run_script
+        * _relative_load --> _relative_run_script
+        * pyscript --> run_pyscript
 
 ## 0.9.13 (June 14, 2019)
 * Bug Fixes