Update docs on requirements for CSV support
Update docs on requirements for CSV support

Praveen2112/presto,electrum/presto,treasure-data/presto,electrum/presto,treasure-data/presto,dain/presto,martint/presto,Praveen2112/presto,ebyhr/presto,losipiuk/presto,dain/presto,electrum/presto,11xor6/presto,treasure-data/presto,dain/presto,smartnews/presto,hgschmie/presto,martint/presto,smartnews/presto,erichwang/presto,Praveen2112/presto,dain/presto,treasure-data/presto,ebyhr/presto,losipiuk/presto,erichwang/presto,losipiuk/presto,martint/presto,hgschmie/presto,treasure-data/presto,electrum/presto,dain/presto,hgschmie/presto,ebyhr/presto,11xor6/presto,hgschmie/presto,martint/presto,losipiuk/presto,martint/presto,ebyhr/presto,Praveen2112/presto,11xor6/presto,treasure-data/presto,hgschmie/presto,smartnews/presto,erichwang/presto,erichwang/presto,ebyhr/presto,erichwang/presto,smartnews/presto,Praveen2112/presto,smartnews/presto,electrum/presto,losipiuk/presto,11xor6/presto,11xor6/presto