Added changelog entry for 3.12.1.
diff --git a/CHANGES.txt b/CHANGES.txt
index 6234f16..3c093e3 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,3 +1,10 @@
+2020-05-20 version 3.12.1 (C++/Java/Python/PHP/Objective-C/C#/Ruby/JavaScript)
+
+ Ruby
+ * Re-add binary gems for Ruby 2.3 and 2.4. These are EOL upstream, however
+ many people still use them and dropping support will require more
+ coordination.
+
2020-05-12 version 3.12.0 (C++/Java/Python/PHP/Objective-C/C#/Ruby/JavaScript)
Protocol Compiler