[postgis-devel] PostGIS Code Sprint signup page

[Regina Obe]

I've set up a signup page.  Dan and Darafei, I put your names on their with
a ?  If you are sure you'll be coming, you can take off the question mark.

https://trac.osgeo.org/postgis/wiki/PostGISCodeSprint2018

I also put a date in stone, but we can change the dates if needed.

Others planning on coming, please sign up and note if you would prefer a
different date period.

Thanks,
Regina