Fixes to README.md.
Fixes to README.md.

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