Adds link to PTPBio paper to Why Phyloreferencing (#53)
Adds link to PTPBio paper to Why Phyloreferencing (#53)

* Adds link to PTPBio paper to Why Phyloreferencing"

* Update _pages/about.md
phyloref/phyloref.github.io,phyloref/phyloref.github.io,phyloref/phyloref.github.io,phyloref/phyloref.github.io