This issue is to keep track of development process.

• New method restrictChatMember.
  • unitest
• New method promoteChatMember.
  • unitest
• New parameter until_date added to kickChatMember for temporary bans.
• New method exportChatInviteLink.
  • unitest
• New method setChatPhoto.
  • unitest
• New method deleteChatPhoto.
  • unitest
• New method setChatTitle.
  • unitest
• New method setChatDescription.
  • unitest
• New method pinChatMessage.
  • unitest
• New method unpinChatMessage.
  • unitest
• New fields photo, description and invite_link added to the Chat object.
• New fields until_date, can_be_edited, can_change_info, can_post_messages, can_edit_messages, can_delete_messages, can_invite_users, can_restrict_members, can_pin_messages, can_promote_members, can_send_messages, can_send_media_messages, can_send_other_messages and can_add_web_page_previews added to the ChatMember object.
  • unitest (only for attributes we unitest their respective method above)