Colorize status in output

[fflorent]

Context

When running the checker (as a human), it is hard to read the output.

Proposed solution

• By default, colorize the status (ERROR in red, SUCCESS in green)
• Add the --no-color option to disable it (for instance in CI when they don't support termcolors)

[azmeuk]

Thank you for your contribution. However I would prefer to keep this project as small as possible.
There is a colored output for scim2-tester in its integration in scim2-cli.
You can use it with scim https://scim.example test for instance. If you wish to improve the output, you can open a PR there!