CHANGELOG.md in groupdate-1.0.3 vs CHANGELOG.md in groupdate-1.0.4

@@ -1,4 +1,9 @@
+# 1.0.4
+
+- Added global week_start option
+- Fixed bug with NULL values and series
+
 ## 1.0.3
 
 - Fixed deprecation warning when used with will_paginate
 - Fixed bug with DateTime series