pytest is recommended entry point

[hugovk]

See pytest-dev/pytest#1629.

[coveralls]

Coverage increased (+14.9%) to 96.661% when pulling 64df64f on hugovk:patch-2 into de2ac66 on dbrgn:master.

[dbrgn]

Thanks! It's probably a good idea to remove detailed pinning from test dependencies, but maybe we should still pin the major version?

[hugovk]

Personally I wouldn't bother because I'd like to discover problems sooner, but I have occasionally seen pins something like pytest<=3. Would you like that doing?

[dbrgn]

Yeah that would be great!

Also, you probably need to rebase against master, as the other PR upgraded pytest already.

[coveralls]

Coverage remained the same at 96.88% when pulling 969fa64 on hugovk:patch-2 into 3effd0f on dbrgn:master.

[hugovk]

Rebased and updated!