Retroactively add Matthew Brett to the aboutus file
Retroactively add Matthew Brett to the aboutus file

He was already in the AUTHORS, but it seems that he was never added to
the aboutus.

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