Coverage badge shows unknown status

[ivmai]

The issue is initially mentioned in #66: Coveralls either does not get info about branch, or cannot fetch branches from Github.
Reported in lemurheavy/coveralls-public#1815

[ivmai]

I tried to pass --branch=${TRAVIS_BRANCH} to coveralls-lcov but it does not help. I tried also some other workarounds - none helps.

[ivmai]

Fixed in PR #94