updated CHANGELOG for 3.3.12

Author: fabpot

CHANGELOG-3.3.md

@@ -7,6 +7,12 @@ in 3.3 minor versions.
 To get the diff for a specific change, go to https://github.com/symfony/symfony/commit/XXX where XXX is the change hash
 To get the diff between two versions, go to https://github.com/symfony/symfony/compare/v3.3.0...v3.3.1
 
+* 3.3.12 (2017-11-13)
+
+ * bug #24954 [DI] Fix dumping with custom base class (nicolas-grekas)
+ * bug #24952 [HttpFoundation] Fix session-related BC break (nicolas-grekas, sroze)
+ * bug #24929 [Console] Fix traversable autocomplete values (ro0NL)
+
 * 3.3.11 (2017-11-10)
 
  * bug #24888 [FrameworkBundle] Specifically inject the debug dispatcher in the collector (ogizanagi)