docs: add pull request link

Author: nedbat

CHANGES.rst

@@ -27,11 +27,12 @@ Unreleased
   sys.monitoring, as reported in `issue 1991`_.  This is now fixed.
 
 - Fix: we can now measure coverage for code in Python archive (.par) files.
+  Thanks, `Itamer Oren <pull 1984_>`_.
 
+.. _pull 1984: https://github.com/nedbat/coveragepy/pull/1984
 .. _issue 1991: https://github.com/nedbat/coveragepy/issues/1991
 
 
-
 .. start-releases
 
 .. _changes_7-9-1: