Add an alias to improve git shortlog output (#12286)

* Add an alias to improve git shortlog output

* Add another

.mailmap

@@ -58,6 +58,8 @@ Kaxil Naik <kaxilnaik@apache.org> <kaxilnaik@gmail.com>
 Kousuke Saruta <sarutak@oss.nttdata.co.jp>
 Kousuke Saruta <sarutak@oss.nttdata.co.jp> <sarutak@oss.nttdata.com>
 Marcin Szymański <ms32035@gmail.com>
+Martijn Pieters <mj@zopatista.com>
+Martijn Pieters <mj@zopatista.com> <github.com@zopatista.com>
 Matthew Bruce <matthew.bruce@shopify.com> <matthew.robert.bruce@gmail.com>
 Maxime Beauchemin <maxime.beauchemin@apache.org> <maxime_beauchemin@i-0963e1d9.inst.aws.airbnb.com>
 Maxime Beauchemin <maxime.beauchemin@apache.org> <maxime_beauchemin@i-a94af485.inst.aws.airbnb.com>
@@ -93,5 +95,6 @@ Tomek Urbaszek <turbaszek@apache.org> <turbaszek@gmail.com>
 Tomek Urbaszek <turbaszek@apache.org> <tomasz.urbaszek@polidea.com>
 Xiaodong Deng <xd_deng@hotmail.com>
 Xiaodong Deng <xd_deng@hotmail.com> <11539188+XD-DENG@users.noreply.github.com>
+Xiaodong Deng <xd_deng@hotmail.com> <xd.deng.r@gmail.com>
 Yuen-Kuei Hsueh <ph.study@gmail.com>
 Zikun Zhu <33176974+zikun@users.noreply.github.com>