coveralls is flaky - ignore result

> Couldn't find a repository matching this job

Author: dnozay

tox.ini

@@ -17,7 +17,7 @@ commands =
     coverage run --append setup.py test
     coverage report --omit='.tox/*'
     codecov -e TOXENV
-    coveralls
+    -coveralls
 passenv = CI TRAVIS_BUILD_ID TRAVIS TRAVIS_BRANCH TRAVIS_JOB_NUMBER TRAVIS_PULL_REQUEST TRAVIS_JOB_ID TRAVIS_REPO_SLUG TRAVIS_COMMIT
 
 [testenv:begin]