Updated change log

Author: kmvanbrunt

CHANGELOG.md

@@ -1,6 +1,7 @@
 ## 0.9.12 (March TBD, 2019)
 * Bug Fixes
     * Fixed a bug in how redirection and piping worked inside ``py`` or ``pyscript`` commands
+    * Fixed bug in `async_alert` where it didn't account for prompts that contained newline characters
 * Enhancements
     * Added ability to include command name placeholders in the message printed when trying to run a disabled command.
         * See docstring for ``disable_command()`` or ``disable_category()`` for more details.