Calendar Changes

• add recent xtks failure to adhoc holidays (#76) @mixilchenko
• move xtks bound_start to 1997 (#77) @mixilchenko
• Add Passover interim days which early close days on XTAE. (#75) @jenskeiner
• Fix XBUD Christmas holiday observances. (#74) @jenskeiner
• Use proper names for ASEX national holidays. (#72) @jenskeiner
• Added tropical storm Nangka for 20201013 for HK Exchange (#58) @leech74
• Add trading calendar for Bucharest Stock Exchange - XBSE (#56) @pbabics
• Correct xkls_holidays.py 2021 (#57) @mrkgoh
• Add calendar for Kazakhstan AIXK exchange (#55) @pbabics
• SSE Trading calender missing dates (#36) @supersunpower

Build Changes

• BLD: Revert dependabot change (#50) @gerrymanoim
• BLD: See if dependabot can manage requirement bumps (#47) @gerrymanoim
• BLD: Bump requirements_locked.txt (#44) @gerrymanoim

Enhancements

• Add ExchangeCalendar.date_to_session_label (#66) @maread99
• Improve parsing (#65) @maread99
• ENH: Expose calendar kwargs and handle out-of-bounds (#54) @maread99
• Update/add dispatcher alias methods (#35) @maread99

Maintenance

• Fix conflict between holidays and special dates (#39) @maread99
• Update csv files for breaks (#69) @maread99
• Delete .DS_Store (#67) @maread99
• Bump actions/cache from 2.1.3 to 2.1.6 (#46) @dependabot
• Bump actions/setup-python from 2.2.1 to 2.2.2 (#45) @dependabot
• MAINT: Specify python requires in setup.py (#62) @gerrymanoim