improve(ci): run tests against every supported Python versions

[Guts]

No description provided.

[3nids]

Is this really worth it?
It sounds enough to me to do the min version, especially since we don't have any requirements.

[Guts]

Sure but sometimes it's a chance to anticipate a deprecated warning or syntax change. Well given the project size, it's may not be necessary but it does not hurt too.

[3nids]

let's do min and max ? ;)

[Guts]

Even I don't get the logic behind, feel free to do as you wish, it does not matter too much to me on this one 😉.