README: Add `author_email`
README: Add `author_email`

`author_email` must be provided when
`author` in `setup.py`.

coala-analyzer/coala,shreyans800755/coala,sils1297/coala,Nosferatul/coala,aptrishu/coala,arush0311/coala,arush0311/coala,Balaji2198/coala,MariosPanag/coala,yashtrivedi96/coala,impmihai/coala,Asnelchristian/coala,nemaniarjun/coala,kartikeys98/coala,Asalle/coala,coala/coala,ayushin78/coala,CruiseDevice/coala,CruiseDevice/coala,coala/coala,JohnS-01/coala,jayvdb/coala,RJ722/coala,Asalle/coala,arjunsinghy96/coala,yashLadha/coala,meetmangukiya/coala,rimacone/testing2,Shade5/coala,damngamerz/coala,NiklasMM/coala,SanketDG/coala,arjunsinghy96/coala,aptrishu/coala,NiklasMM/coala,Asnelchristian/coala,arjunsinghy96/coala,MariosPanag/coala,arush0311/coala,yashLadha/coala,yashtrivedi96/coala,NiklasMM/coala,kartikeys98/coala,nemaniarjun/coala,SanketDG/coala,MariosPanag/coala,Shade5/coala,impmihai/coala,Asnelchristian/coala,shreyans800755/coala,rimacone/testing2,shreyans800755/coala,impmihai/coala,netman92/coala,RJ722/coala,netman92/coala,refeed/coala,refeed/coala,damngamerz/coala,aptrishu/coala,incorrectusername/coala,kartikeys98/coala,sagark123/coala,sils1297/coala,RJ722/coala,rimacone/testing2,jayvdb/coala,sagark123/coala,Asalle/coala,refeed/coala,sils1297/coala,karansingh1559/coala,coala-analyzer/coala,sagark123/coala,JohnS-01/coala,yashtrivedi96/coala,Nosferatul/coala,yashLadha/coala,incorrectusername/coala,meetmangukiya/coala,SanketDG/coala,incorrectusername/coala,coala/coala,nemaniarjun/coala,Balaji2198/coala,ayushin78/coala,netman92/coala,coala-analyzer/coala,damngamerz/coala,ayushin78/coala,Nosferatul/coala,JohnS-01/coala,Balaji2198/coala,CruiseDevice/coala,Shade5/coala,meetmangukiya/coala,jayvdb/coala,karansingh1559/coala,karansingh1559/coala