clean up readme
clean up readme

alexdebrie/pachyderm,phacops/pachyderm,klucar/pachyderm,pachyderm/pfs,wideioltd/pachyderm,henrylee2cn/pachyderm,alexdebrie/pachyderm,ShengjieLuo/pachyderm,klucar/pachyderm,henrylee2cn/pachyderm,pachyderm/pfs,sambooo/pachyderm,sambooo/pachyderm,pachyderm/pfs,phacops/pachyderm,klucar/pachyderm,kunthar/pachyderm,ShengjieLuo/pachyderm,ShengjieLuo/pachyderm,kunthar/pachyderm,alexdebrie/pachyderm,sambooo/pachyderm,wideioltd/pachyderm