Simplify coveralls settings

Signed-off-by: Michal Čihař <michal@cihar.com>
Translated using Weblate (Portuguese (Brazil))

Currently translated at 100.0% (2768 of 2768)
Merge remote-tracking branch 'origin/master'
Clarify the parameter's origin

Signed-off-by: Marc Delisle <marc@infomarc.info>
Translated using Weblate (Korean)

Currently translated at 79.2% (2194 of 2768)
Merge remote-tracking branch 'origin/master'