CHANGELOG.md in mb_string-0.1.2 vs CHANGELOG.md in mb_string-0.1.3

@@ -1,2 +1,5 @@
+## 0.1.3 (Tue Dec 2 2015)
+* Improve performance [78c2ae7]
+
 ## 0.1.2 (Tue Dec 1 2015)
 * Add `mb_truncate` method [099f432]