SetuptoolsDeprecationWarning

[zishun]

Currently, we build with python setup.py install and get the warnings:

running install
<...>/site-packages/setuptools/command/install.py:34: SetuptoolsDeprecationWarning: setup.py install is deprecated. Use build and pip and other standards-based tools.
  warnings.warn(
<...>/site-packages/setuptools/command/easy_install.py:144: EasyInstallDeprecationWarning: easy_install command is deprecated. Use build and pip and other standards-based tools.
  warnings.warn(

Let's move to pip install ..