README demo command still suggests stop_step="" but pipeline expects named steps

[Ziyuli1121]

Hi! Thanks for the great work.

When I run rf_diffusion/benchmark/pipeline.py --config-name=open_source_demo stop_step="" ...

It throws "ValueError: '' is not in list", since step_in_scope only accepts ['sweep','foldseek','graft','tm_align','mpnn','thread_mpnn','score','metrics','compile','end'].

I should use stop_step=end to run the whole design process.

[rclune]

Yes, using stop_step=end is the correct way to run the whole design process, I've created a PR for this fix. (#26)