fixed downloads instructions in the README and a typo
fixed downloads instructions in the README and a typo

atsao72/sympy,kmacinnis/sympy,pbrady/sympy,beni55/sympy,grevutiu-gabriel/sympy,wanglongqi/sympy,yashsharan/sympy,atsao72/sympy,MechCoder/sympy,kumarkrishna/sympy,Davidjohnwilson/sympy,srjoglekar246/sympy,emon10005/sympy,sunny94/temp,MridulS/sympy,debugger22/sympy,Titan-C/sympy,cccfran/sympy,jerli/sympy,Vishluck/sympy,diofant/diofant,shipci/sympy,sampadsaha5/sympy,sahilshekhawat/sympy,farhaanbukhsh/sympy,moble/sympy,hrashk/sympy,amitjamadagni/sympy,debugger22/sympy,drufat/sympy,Vishluck/sympy,ChristinaZografou/sympy,pernici/sympy,maniteja123/sympy,jerli/sympy,ahhda/sympy,rahuldan/sympy,cswiercz/sympy,mcdaniel67/sympy,grevutiu-gabriel/sympy,shikil/sympy,Sumith1896/sympy,kmacinnis/sympy,sunny94/temp,kaushik94/sympy,Designist/sympy,jbbskinny/sympy,sampadsaha5/sympy,kumarkrishna/sympy,lindsayad/sympy,pandeyadarsh/sympy,yukoba/sympy,sahmed95/sympy,souravsingh/sympy,mattpap/sympy-polys,AunShiLord/sympy,shipci/sympy,hargup/sympy,lindsayad/sympy,ryanGT/sympy,MridulS/sympy,mcdaniel67/sympy,cccfran/sympy,sunny94/temp,souravsingh/sympy,meghana1995/sympy,kaichogami/sympy,iamutkarshtiwari/sympy,mafiya69/sympy,beni55/sympy,rahuldan/sympy,dqnykamp/sympy,debugger22/sympy,yukoba/sympy,madan96/sympy,toolforger/sympy,Mitchkoens/sympy,oliverlee/sympy,bukzor/sympy,bukzor/sympy,sahmed95/sympy,shipci/sympy,ahhda/sympy,chaffra/sympy,wyom/sympy,hrashk/sympy,drufat/sympy,lidavidm/sympy,cswiercz/sympy,kmacinnis/sympy,lidavidm/sympy,yukoba/sympy,liangjiaxing/sympy,pandeyadarsh/sympy,pandeyadarsh/sympy,AunShiLord/sympy,vipulroxx/sympy,postvakje/sympy,maniteja123/sympy,kevalds51/sympy,postvakje/sympy,iamutkarshtiwari/sympy,Titan-C/sympy,atreyv/sympy,liangjiaxing/sympy,kevalds51/sympy,MridulS/sympy,jaimahajan1997/sympy,Shaswat27/sympy,Titan-C/sympy,atsao72/sympy,emon10005/sympy,Sumith1896/sympy,asm666/sympy,hargup/sympy,Sumith1896/sympy,yashsharan/sympy,oliverlee/sympy,AkademieOlympia/sympy,kumarkrishna/sympy,ga7g08/sympy,toolforger/sympy,jbbskinny/sympy,souravsingh/sympy,Curious72/sympy,skidzo/sympy,skidzo/sympy,Mitchkoens/sympy,jamesblunt/sympy,tovrstra/sympy,wyom/sympy,oliverlee/sympy,Arafatk/sympy,madan96/sympy,garvitr/sympy,ChristinaZografou/sympy,meghana1995/sympy,amitjamadagni/sympy,saurabhjn76/sympy,minrk/sympy,abhiii5459/sympy,jaimahajan1997/sympy,emon10005/sympy,abhiii5459/sympy,postvakje/sympy,Designist/sympy,sahilshekhawat/sympy,aktech/sympy,ga7g08/sympy,lindsayad/sympy,jaimahajan1997/sympy,vipulroxx/sympy,moble/sympy,kaichogami/sympy,mafiya69/sympy,AkademieOlympia/sympy,asm666/sympy,drufat/sympy,farhaanbukhsh/sympy,abloomston/sympy,saurabhjn76/sympy,VaibhavAgarwalVA/sympy,Shaswat27/sympy,atreyv/sympy,beni55/sympy,maniteja123/sympy,wanglongqi/sympy,chaffra/sympy,grevutiu-gabriel/sympy,AkademieOlympia/sympy,garvitr/sympy,jbaayen/sympy,KevinGoodsell/sympy,cccfran/sympy,shikil/sympy,bukzor/sympy,aktech/sympy,toolforger/sympy,ga7g08/sympy,Gadal/sympy,Davidjohnwilson/sympy,fperez/sympy,abhiii5459/sympy,rahuldan/sympy,garvitr/sympy,Arafatk/sympy,madan96/sympy,cswiercz/sympy,Curious72/sympy,skirpichev/omg,MechCoder/sympy,ChristinaZografou/sympy,lidavidm/sympy,jbbskinny/sympy,MechCoder/sympy,hazelnusse/sympy-old,VaibhavAgarwalVA/sympy,farhaanbukhsh/sympy,skidzo/sympy,AunShiLord/sympy,sahilshekhawat/sympy,Mitchkoens/sympy,chaffra/sympy,Gadal/sympy,hargup/sympy,hazelnusse/sympy-old,Designist/sympy,wyom/sympy,Vishluck/sympy,jamesblunt/sympy,VaibhavAgarwalVA/sympy,abloomston/sympy,meghana1995/sympy,liangjiaxing/sympy,atreyv/sympy,kaushik94/sympy,Arafatk/sympy,minrk/sympy,saurabhjn76/sympy,dqnykamp/sympy,shikil/sympy,pbrady/sympy,asm666/sympy,wanglongqi/sympy,iamutkarshtiwari/sympy,Davidjohnwilson/sympy,mcdaniel67/sympy,ahhda/sympy,hrashk/sympy,vipulroxx/sympy,aktech/sympy,jamesblunt/sympy,sampadsaha5/sympy,abloomston/sympy,jerli/sympy,sahmed95/sympy,Shaswat27/sympy,kaushik94/sympy,Curious72/sympy,Gadal/sympy,mafiya69/sympy,moble/sympy,kaichogami/sympy,pbrady/sympy,flacjacket/sympy,dqnykamp/sympy,yashsharan/sympy,kevalds51/sympy