Steven Bethard designated a new maintainer for argparse (GH-15605) (GH-15606)

(cherry picked from commit 496058f59937da478eb172c864502b5dcf67705b)

Co-authored-by: Raymond Hettinger <rhettinger@users.noreply.github.com>
diff --git a/Lib/argparse.py b/Lib/argparse.py
index 6f0b37c..a6ab3b3 100644
--- a/Lib/argparse.py
+++ b/Lib/argparse.py
@@ -1,4 +1,5 @@
 # Author: Steven J. Bethard <steven.bethard@gmail.com>.
+# New maintainer as of 29 August 2019:  Raymond Hettinger <raymond.hettinger@gmail.com>
 
 """Command-line parsing library