Fix the update script so we don't write any dupes.
Fix the update script so we don't write any dupes.

Signed-off-by: Steven Black <efe92b1a55c3d64d903ecee9d602a2db10915477@stevenblack.com>

maxmurder/hosts,gfyoung/hosts,StevenBlack/hosts,WillPresley/hosts,maxmurder/hosts,gfyoung/hosts,bmcculley/hosts,FrancoGag/hosts,sampaisley/hosts,borisschapira/hosts,StevenBlack/hosts,usrjim/hosts,WillPresley/hosts,FrancoGag/hosts