fix osx pipeline in travis

Author: giannisdoukas

.travis.yml

@@ -31,7 +31,6 @@ matrix:
         - pip3 install virtualenv
         - virtualenv -p python3 venv
         - source venv/bin/activate
-        - chmod +x $(python -c "import repo2docker; print(repo2docker.__file__[:-11])")/buildpacks/repo2docker-entrypoint
         - pip3 install -U -r test-requirements.txt
       script: coverage run --source ipython2cwl -m unittest discover tests
       env: TRAVIS_IGNORE_DOCKER=true