remove DependencyWarning warning from pip._internal
remove DependencyWarning warning from pip._internal

pfmoore/pip,pypa/pip,sbidoul/pip,xavfernandez/pip,pradyunsg/pip,xavfernandez/pip,pfmoore/pip,sbidoul/pip,pradyunsg/pip,rouge8/pip,rouge8/pip,xavfernandez/pip,rouge8/pip,pypa/pip