Add helpers to RequirementSet to directly add requirements (#6904)
Add helpers to RequirementSet to directly add requirements (#6904)


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