fix .coverage processing

.travis/upload_coverage.sh

@@ -6,7 +6,6 @@ set -x
 NO_COVERAGE_TOXENVS=(pep8)
 if ! [[ "${NO_COVERAGE_TOXENVS[*]}" =~ "${TOXENV}" ]]; then
     source ~/.venv/bin/activate
-    ln .tox/.coverage .coverage
     # on osx, tests run as root, need access to .coverage
     sudo chmod 666 .coverage
     codecov -e TRAVIS_OS_NAME TOXENV