Add Authenticate method.
Add Authenticate method.

SteamTrade.SteamWeb now has the SteamKit based Auth method. Had to add
more params.

JackHarknes/Bot1,nuller1joe/SteamBot,stackia/SteamBot,Moondarker/CSGOWinBig-SteamBot,trervorx/SteamBot,xversial/SteamBot,fjch1997/SteamBot,niachris/SteamBotNew,MattrAus/SteamBot,avoak/SteamBot,MadBender/SteamBot,trervorx/SteamBot,terryhau/SteamBot,ChalkyBrush/SteamBots,MadBender/SteamBot,alanfort/CSGOWinBig-SteamBot,Wendt9222/SteamBot-1,wowzone/gamerpro,stigping/SteamBot,stigping/SteamBot,Banana23/Tryout,martingabriel/SteamBot,terryhau/SteamBot,Banana23/Tryout,avoak/SteamBot,Schwehn42/SteamBot,ztizzlegaming/CSGOWinBig-SteamBot,zigagrcar/SteamTradeOffersBot,ChalkyBrush/SteamBots,wowzone/gamerpro,Schwehn42/SteamBot,JackHarknes/Bot1,23RDGit/CSGOWinBig-SteamBot,Alex-Nabu/CSGOWinBig-SteamBot,novasdream/SteamBot,BlueRaja/SteamBot,Moondarker/CSGOWinBig-SteamBot,wqbill/SteamBot,TheRod1990/SteamBot,Bottswana/SteamBot,GAMELASTER/SteamBot,TheRod1990/SteamBot,ztizzlegaming/CSGOWinBig-SteamBot,BuzzyOG/CSGOWinBig-SteamBot,zigagrcar/SteamTradeOffersBot,Bottswana/SteamBot,waylaidwanderer/SteamTradeOffersBot,GAMELASTER/SteamBot,23RDGit/CSGOWinBig-SteamBot,BuzzyOG/CSGOWinBig-SteamBot,stackia/SteamBot,fjch1997/SteamBot,Jessecar96/SteamBot,novasdream/SteamBot,wqbill/SteamBot,StormReaper/SteamBot,martingabriel/SteamBot,icodingforfood/SteamBot,Murzyneczka/CSGOWinBig-SteamBot,Alex-Nabu/CSGOWinBig-SteamBot,GoeGaming/SteamBot,darren1998s/SteambotTest,alanfort/CSGOWinBig-SteamBot,StormReaper/SteamBot,nuller1joe/SteamBot,MattrAus/SteamBot,JackHarknes/Bot1,icodingforfood/SteamBot,tarun200897/SteamBot,Wendt9222/SteamBot-1,GoeGaming/SteamBot,niachris/SteamBotNew,xversial/SteamBot,Murzyneczka/CSGOWinBig-SteamBot,tarun200897/SteamBot