Fix version number in CHANGELOG.
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3bc7c37..b595ef3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,4 @@
-# 0.2.12-dev
+# 0.2.12
 
 * Add support for assert() in constructor initializers.
 * Correctly indent the right-hand side of `is` and `as` expressions.