Create 2019-10-07-summer-updates.md
Create 2019-10-07-summer-updates.md

Added a WIP page for updates. I essentially just pulled these from memory + trawled the various git histories. We should add the summarized contents of the quarterly reports here.
slateci/slateci.github.io,slateci/slateci.github.io,slateci/slateci.github.io,slateci/slateci.github.io