Update contributors

[osabahat]

Update About page with any remaining team members and the span of the project:

https://github.com/CodeForPhilly/paws-data-pipeline/blob/master/src/client/src/pages/About.js

[kfettich]

Developers:

• Osman Sabahat
• Stephen Carroll
• Diego Delgado
• Carlos Dominguez
• Benjamin Deck
• Sam Lufi
• Ruthie Fields

External collaborators and supporters:

• Josephine Dru