Issue #20362: Honour TestCase.longMessage correctly in assertRegex.

Patch from Ilia Kurenkov.
diff --git a/Misc/ACKS b/Misc/ACKS
index 59828fb..7418d02 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -786,6 +786,7 @@
 Dave Kuhlman
 Jon Kuhn
 Toshio Kuratomi
+Ilia Kurenkov
 Vladimir Kushnir
 Erno Kuusela
 Ross Lagerwall
diff --git a/Misc/NEWS b/Misc/NEWS
index 825bd15..5035e47 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -17,6 +17,9 @@
 Library
 -------
 
+- Issue #20362: Honour TestCase.longMessage correctly in assertRegex.
+  Patch from Ilia Kurenkov.
+
 - Issue #24847: Removes vcruntime140.dll dependency from Tcl/Tk.
 
 - Issue #23572: Fixed functools.singledispatch on classes with falsy