Changes

** GiveWell used to have a wiki -- talk about the launch and later removal of the wiki?

** Cover the 2019 board membership changes https://www.givewell.org/changes-in-board-membership

** More staff changes should be included✔. In particular, the joining of Alexander Berger✔ and Natalie Stone, the joining of Chelsea Tabart✔, the eventual departure of Holden✔ and Alexander✔ as they switch fully to the Open Philanthropy Project, the departure of Chelsea Tabart✔.

** Cover the October 2019 office move from San Francisco to Oakland (unfortunately the only reference for the date of move is the GiveWell November 2019 newsletter, but this doesn't seem to be visible on the web).