Statuscheck

Changed
- Use `StatusIO` security type for security incidents

Changed
- Improve `StatusIO` check types
- Dependencies update

Changed
- Drop deprecated pytest-runner
- Dependencies update

Changed
- Handle major Salesforce incidents properly (https://github.com/amureki/statuscheck/pull/76)

Added
- Added CLI option to check all services (useful for debugging and/or gives you a good feeling):
`statuscheck all` (https://github.com/amureki/statuscheck/pull/74)

Changed
- Fixed Heroku incidents verbose display (https://github.com/amureki/statuscheck/pull/74)

Changed
- Add name to summary, smaller clean ups (https://github.com/amureki/statuscheck/pull/73)