.mailmap: add an alias for Danylo Piliaiev

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/1999>
diff --git a/.mailmap b/.mailmap
index edb418d..69950fb 100644
--- a/.mailmap
+++ b/.mailmap
@@ -166,6 +166,8 @@
 
 Daniel Stone <daniels@collabora.com> <daniel@fooishbar.org>
 
+Danylo Piliaiev <danylo.piliaiev@globallogic.com> <danylo.piliaiev@gmail.com>
+
 David Miller <davem@davemloft.net> David S. Miller <davem@davemloft.net>
 David Miller <davem@davemloft.net> Dave Miller <davem@davemloft.net>
 David Miller <davem@davemloft.net> davem69 <davem69>