Dredged through the git commit history and added some 13 missing people into the AUTHORS file.
Dredged through the git commit history and added some 13 missing people into the AUTHORS file.

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