**Requirements**
* minimum django version is now 2.2
**New**
* added base json encoder
* added support for translated strings
* added add_expected_actors() to MessageCard
**Incompatible changes**
* AdaptiveCard
* removed add_action() form ActionSet in favour to add_actions()
* removed add_item() from Container in favour to add_items()
* removed add_item() from Column in favour to add_items()
* removed add_column() form ColumnSet in favour to add_columns()
* removed add_fact() from FactSet in favour to add_facts()
* removed add_image() from ImageSet in favour to add_images()
* MessageCard
* removed add_header() from HttpPOST in favour to add_headers()
* removed add_input()/add_action() from ActionCard in favour to add_inputs()/add_actions()
* removed add_section()/add_action() from MessageCard in favour to add_sections()/add_actions()
* removed add_fact()/add_potential_action() from Section in favour to add_facts()/add_potential_actions()
**Other**
* removed unnecessary typing