Tox Config: Omit tests in html report and erase previous reports

[clarete]

No description provided.

[clarete]

Let me know if you think it's a good idea to just show the report instead of generating the html file. I can change that in this patch as well. Thanks for the awesome lib :)

[clarete]

This is how it looks with the patch!

[Julian]

Hey, thanks!

Adding coverage report to the output is fine with me certainly. AFAIU though we don't need to call coverage erase, as long as you don't pass --append coverage run will do that for us. Is there a reason you think we need it?

Also we shouldn't omit coverage on tests, it's important to run coverage on everything, and in particular tests, to make sure they're all executed.

But yeah, adding coverage report sounds great.