add note about `standard` to readme
add note about `standard` to readme

yciabaud/webtorrent,LinusU/webtorrent,webtorrent/webtorrent,tradle/webtorrent,gillesdemey/webtorrent,nicola/webtorrent,Stiveknx/webtorrent,feross/webtorrent,fisch0920/webtorrent,madmarks/webtorrent,adriagalin/webtorrent,sideffect0/webtorrent,whitef0x0/webtorrent,jamesliu96/webtorrent,solderzzc/webtorrent,karissa/webtorrent,sideffect0/webtorrent,ngjermundshaug/webtorrent,serafinfernandez/webtorrent,whitef0x0/webtorrent,beni55/webtorrent,loon3/webtorrent,FabianFrancoRoldan/webtorrent,LinusU/webtorrent,jakefb/webtorrent,MiracleBlue/webtorrent,jamesliu96/webtorrent,lucamaraschi/webtorrent,tradle/webtorrent,madmarks/webtorrent,rom1504/webtorrent,ericwooley/webtorrent,ericwooley/webtorrent,beni55/webtorrent,solderzzc/webtorrent,yciabaud/webtorrent,akiva/webtorrent,lucamaraschi/webtorrent,serafinfernandez/webtorrent,Stiveknx/webtorrent,fisch0920/webtorrent,loon3/webtorrent,rozifus/webtorrent,joshterrill/webtorrent,karissa/webtorrent,jakefb/webtorrent,feross/webtorrent,dan-hill/webtorrent,arestov/webtorrent,FabianFrancoRoldan/webtorrent,ngjermundshaug/webtorrent,joshterrill/webtorrent,gillesdemey/webtorrent,rozifus/webtorrent,adriagalin/webtorrent,webtorrent/webtorrent,dan-hill/webtorrent,nicola/webtorrent,MiracleBlue/webtorrent,akiva/webtorrent