[release] Add release notes for 2.10.5

Change-Id: I705c98551cc7e4f1435e1faf667f8fc0184699ac
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/179774
Reviewed-by: Michael Thomsen <[email protected]>

Author: athomas

CHANGELOG.md

@@ -1,3 +1,9 @@
+## 2.10.5 - 2020-01-21
+
+This is a patch release that fixes a crash in the Dart VM. (issue [#44563][]).
+
+[#44563]: https://github.com/dart-lang/sdk/issues/44563
+
 ## 2.10.4 - 2020-11-12
 
 This is a patch release that fixes a crash in the Dart VM (issues [#43941][],