Update about.md

[likeajumprope]

The about.md file needs to be updated.

1. Adding the Gau et al. 2020 brainhack paper to the publication list
2. updating the members spreadsheet

[jhlegarreta]

1. Adding the Gau et al. 2020 brainhack paper to the publication list

Done in PR #32 by @likeajumprope.