CHANGELOG.md in lbfgsb-0.3.2 vs CHANGELOG.md in lbfgsb-0.4.0

@@ -1,4 +1,7 @@
+## 0.4.0
+- Add type declaration file: sig/lbfgsb.rbs
+
 ## 0.3.2
 - Refactor native extension codes.
 - Update documentations.
 
 ## 0.3.1