Use pip2 rather than pip
Use pip2 rather than pip

Travis OSX only has pip2/pip3, not pip.
cf. https://github.com/travis-ci/travis-ci/issues/8829

RJPercival/certificate-transparency,google/certificate-transparency,RJPercival/certificate-transparency,pphaneuf/certificate-transparency,RJPercival/certificate-transparency,pphaneuf/certificate-transparency,RJPercival/certificate-transparency,pphaneuf/certificate-transparency,google/certificate-transparency,google/certificate-transparency,google/certificate-transparency,pphaneuf/certificate-transparency