added Just Cause 3

lgsm/data/serverlist.csv

@@ -33,6 +33,7 @@ hldm,hldmserver,Half-Life: Deathmatch
 hw,hwserver,Hurtworld
 ins,insserver,Insurgency
 jc2,jc2server,Just Cause 2
+jc3,jc3server,Just Cause 3
 kf,kfserver,Killing Floor
 kf2,kf2server,Killing Floor 2
 l4d,l4dserver,Left 4 Dead