I prefer tabs to spaces, not here to argue, and editorconfig is read by GitHub and let's me change tabs to display as 4 spaces instead of eight. A major win. Also allows me to default their editor to tabs.
This is the main reason I use this, though I use 2 space tabs and my coworkers use 4 space tabs. Things get ugly without editorconfig playing cop. I also force it to show rulers. It doesn't make the other devs grow a conscience, tho.