Version 2.19.0-21.0.dev

Merge commit 'e13dc43a754458837e70338201cc334231b2cc79' into 'dev'
diff --git a/docs/process/breaking-changes.md b/docs/process/breaking-changes.md
index 88f2e27..badf69f 100644
--- a/docs/process/breaking-changes.md
+++ b/docs/process/breaking-changes.md
@@ -78,7 +78,7 @@
 
   * Clear steps for mitigating the change.
 
-* Email Dart Announce (`announce@dartlang.org`):
+* Email [Dart Announce][] (`announce@dartlang.org`):
 
   * Subject: 'Breaking change [bug ID]: [short summary]'
 
@@ -168,3 +168,4 @@
 or in some other way offer the originator a clear timeline for when the breaking
 change can be landed.
 
+[Dart Announce]: https://groups.google.com/a/dartlang.org/g/announce
diff --git a/tools/VERSION b/tools/VERSION
index 10b1d6e..12a6c90 100644
--- a/tools/VERSION
+++ b/tools/VERSION
@@ -27,5 +27,5 @@
 MAJOR 2
 MINOR 19
 PATCH 0
-PRERELEASE 20
+PRERELEASE 21
 PRERELEASE_PATCH 0
\ No newline at end of file