Removing cover-min-percentage=100 from coveralls.

[dhermes]

Fixes#939.

[tseaver]

We dropped running tox -e cover in the "main" tests in Travis, which would block the tox -e coveralls bit (in after_success). Is a drop in coverage still going to show up as a failed check?

[dhermes]

@tseaver The coverage/coveralls check will fail but the continuous-integration/travis-ci/pr check will not. Is that sufficient?

[dhermes]

I can add a fake PR after this for us to test. Something silly like

if False:
print 'I will never happen' # Maybe though because False is just a variable

[tseaver]

If we're sure that PRs will show up with failed checks, then go ahead. I don't really see the value-add of coveralls is over just running tox -e cover within Travis, but if we're going to use it, we should definitely let it work as expected.

[dhermes]

We use coveralls for the fancy badge on the front page. cover is in the default list, so running tox locally will run tox -e cover.

I'm taking your "go ahead" as an LGTM. Happy to rollback if I misunderstood.