build: remove coveralls

[benjello]

Technical changes

• Remove covearalls

Fixes #1073

[benjello]

@bonjourmauko : got a doctest failure

[bonjourmauko]

@bonjourmauko : got a doctest failure

Weird that it didn't fail before. These are expected, however very useless, errors.

[bonjourmauko]

@bonjourmauko : got a doctest failure

Weird that it didn't fail before. These are expected, however very useless, errors.

Actually not that useless.

For example, if you want to build a recarray containing str, you can define by hand the itemsize. Thanks to the testing matrix, we will now that in windows we can have an offset error of 10 bits, and that we should better pad automatically and increase the offset. These are very weird situations, so it is actually good to be able to catch them.

[bonjourmauko]

@benjello it is your PR so I leave the merge to you.