* Addition of exchange holiday calendars using PandasMarketCalendar
* website update for holidays functionality
* Disable pylint too many attributes
* Changes to not show index for dataframe and include metavar
* Setting of default value for holidays
* Merge + black linter
* test fix
Co-authored-by: james <jmaslek11@gmail.com>
Co-authored-by: Jeroen Bouma <jer.bouma@gmail.com>