In CI running for updating the Kaldi version in bob/conda, I got python version conflict: ``` Package python conflicts for: setuptools=41.0.0 -> certifi[version='>=2016.09'] -> python[version='2.7.*,>=2.7,<2.8.0a0,>=3.6,<3.7.0a0'] pathlib=1.0 -> python[version='2.7.*,3.4.*,3.5.*,3.6.*,>=3.6,<3.7.0a0'] cython=0.28.1 -> setuptools -> certifi[version='>=2016.09'] -> python[version='2.7.*,>=2.7,<2.8.0a0,>=3.5,<3.6.0a0,>=3.6,<3.7.0a0'] python=3.7 numpy=1.15.4 -> mkl_random[version='>=1.0.2,<2.0a0'] -> numpy-base[version='>=1.0.2,<2.0a0'] -> python[version='>=2.7,<2.8.0a0,>=3.6,<3.7.0a0,>=3.7,<3.8.0a0'] ```