Issue #23661: unittest.mock side_effects can now be exceptions again.

This was a regression vs Python 3.4. Patch from Ignacio Rossi
diff --git a/Misc/ACKS b/Misc/ACKS
index 8a007ea..9841059 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -1581,3 +1581,4 @@
 Gennadiy Zlobin
 Doug Zongker
 Peter Åstrand
+Ignacio Rossi
diff --git a/Misc/NEWS b/Misc/NEWS
index aaa7f91..2a5b447 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -17,6 +17,9 @@
 Library
 -------
 
+- Issue #23661: unittest.mock side_effects can now be exceptions again. This
+  was a regression vs Python 3.4. Patch from Ignacio Rossi
+
 - Issue #24608: chunk.Chunk.read() now always returns bytes, not str.
 
 - Issue #18684: Fixed reading out of the buffer in the re module.