test-coverage: do not open browser on travis-ci
test-coverage: do not open browser on travis-ci

ibab/root_numpy,ndawe/root_numpy,rootpy/root_numpy,ndawe/root_numpy,rootpy/root_numpy,scikit-hep/root_numpy,ndawe/root_numpy,scikit-hep/root_numpy,rootpy/root_numpy,scikit-hep/root_numpy,ibab/root_numpy,ibab/root_numpy,ndawe/root_numpy,scikit-hep/root_numpy,rootpy/root_numpy,ibab/root_numpy