Add gitflow-avh's deprecation info and date to README (#54)

Co-authored-by: Sebastian Hädrich <11225821+shaedrich@users.noreply.github.com>

Author: ChrisJStone

README.md

@@ -6,9 +6,10 @@ blog post"). This fork adds functionality not added to the original branch.
 
 ## Why another git-flow fork
 The last commit to [gitflow-avh](https://github.com/petervanderdoes/gitflow-avh)
-was on May 23, 2019. Since then there have been a number of issues opened that have
-not be resolved. This fork will address those outstanding issues and open PR's along
-with continueing to maintain the git-flow branching model.
+was on May 23, 2019 and has been archived on Jun 19, 2023. Since 2019 there have
+been a number of issues opened that have not be resolved. This fork will address
+those outstanding issues and open PR's along with continueing to maintain the
+git-flow branching model.
 
 ## Getting started