tox: coveralls: also report to codecov

This is meant to get base coverage on master for codecov.

tox.ini

@@ -163,16 +163,18 @@ commands =
 
 
 [testenv:coveralls]
-passenv = TRAVIS TRAVIS_JOB_ID TRAVIS_BRANCH COVERALLS_REPO_TOKEN
+passenv = CI TRAVIS TRAVIS_* COVERALLS_REPO_TOKEN
 usedevelop = True
 changedir = .
 deps =
     {[testenv]deps}
     coveralls
+    codecov
 commands =
     coverage run --source=_pytest -m pytest testing
     coverage report -m
     coveralls
+    codecov
 
 [testenv:release]
 decription = do a release, required posarg of the version number