CHANGELOG.md in mysql_getlock-0.2.0 vs CHANGELOG.md in mysql_getlock-0.2.1

@@ -1,4 +1,10 @@
+# 0.2.1 (2016-08-28)
+
+Enhancements:
+
+* Raises `LockError` if #synchronize failed to acquore a lock
+
 # 0.2.0 (2016-08-28)
 
 Enhancements:
 
 * Add #self_locked? to check lock is obtained by myself