Add Two Sponsors

[yinlinchen]

Sponsor: School of Information Sciences, University of Illinois Urbana-Champaign
Sponsor Level: Contributor
Link attached to logo: https://ischool.illinois.edu/

Sponsor: Index Data
Sponsor Level: Bronze
Link attached to logo: http://www.indexdata.com/

Sponsor: University of Pittsburgh- University Library System
Sponsor Level: Bronze
Link attached to logo: http://www.library.pitt.edu/

Logo is in the Drive

[escowles]

Closed by #19