~~~~~~~~~~~~~~~ - Corrected the NYSE calendar for Independence Day on Thursday post 2013 to fix 20 - Added new convert_freq() function to convert a date_range to a lower frequency to fix 19
0.10
~~~~~~~~~~~~~~ - Added open_time_default and close_time_default as abstract property methods to fix 17
0.9
~~~~~~~~~~~~~ - Fix 12 to Eurex calendar
0.8
~~~~~~~~~~~~~ - Fix 10 to make merge_schedules work properly for more than 2 markets