AUI-1461 aui-alert HISTORY.md

Subtask of AUI-1458: Update HISTORY.md to reflect source code changes
AUI-alert did not have the commit that the other HISTORY.md files
are starting at (ac999be3361683ccb7a7062b5e347a5e3199dc38). Instead there
was one jira ticket for this component, so that is recorded in this file.