Added thanks and PR links in changlog

CHANGELOG.rst

@@ -25,21 +25,26 @@
 
 * parametrize ids can accept None as specific test id. The
   automatically generated id for that argument will be used.
+  Thanks `@palaviv`_ for the complete PR (`#1468`_).
 
 * improved idmaker name selection in case of duplicate ids in
   parametrize.
+  Thanks `@palaviv`_ for the complete PR (`#1474`_).
 
 *
 
 .. _@milliams: https://github.com/milliams
 .. _@novas0x2a: https://github.com/novas0x2a
 .. _@kalekundert: https://github.com/kalekundert
 .. _@tareqalayan: https://github.com/tareqalayan
+.. _@palaviv: https://github.com/palaviv
 
 .. _#1428: https://github.com/pytest-dev/pytest/pull/1428
 .. _#1444: https://github.com/pytest-dev/pytest/pull/1444
 .. _#1441: https://github.com/pytest-dev/pytest/pull/1441
 .. _#1454: https://github.com/pytest-dev/pytest/pull/1454
+.. _#1468: https://github.com/pytest-dev/pytest/pull/1468
+.. _#1474: https://github.com/pytest-dev/pytest/pull/1474
 
 
 2.9.2.dev1