• add pandas builtin operations check (#843 <- #697)
• avoid unnecessary dedent (#837)
• remove unneeded bar logic
• misc code tidy
• update documentation
  • document default argument overriding (#370)
  • add missing isatty() (#713)
  • update badges
  • add code of conduct
• update framework
  • clean CI stages
  • update CI default py3.6 => py3.7
  • automate snap releases (#686 <- #685)