ChangeLog in td-logger-0.3.20 vs ChangeLog in td-logger-0.3.21

@@ -1,4 +1,9 @@
+== 2013-06-17 version 0.3.21
+
+* Update dependent gem versions
+
+
 == 2013-02-26 version 0.3.20
 
 * Use https scheme for rubygems source
 * Add test_mode
   https://github.com/treasure-data/td-logger-ruby/issues/9