setup.py: Add tests_require
setup.py: Add tests_require

test_requires is similar to install_requires and is populated
using the test-requirements.txt

rresol/coala,damngamerz/coala,MariosPanag/coala,rimacone/testing2,sagark123/coala,tushar-rishav/coala,stevemontana1980/coala,AbdealiJK/coala,NalinG/coala,aptrishu/coala,SambitAcharya/coala,yashtrivedi96/coala,mr-karan/coala,arafsheikh/coala,yashtrivedi96/coala,karansingh1559/coala,Shade5/coala,SambitAcharya/coala,abhiroyg/coala,arafsheikh/coala,yland/coala,stevemontana1980/coala,SambitAcharya/coala,sils1297/coala,yashtrivedi96/coala,rresol/coala,vinc456/coala,svsn2117/coala,yashLadha/coala,jayvdb/coala,sagark123/coala,djkonro/coala,vinc456/coala,meetmangukiya/coala,abhiroyg/coala,SanketDG/coala,CruiseDevice/coala,MariosPanag/coala,d6e/coala,coala-analyzer/coala,Uran198/coala,arafsheikh/coala,coala-analyzer/coala,nemaniarjun/coala,sils1297/coala,kartikeys98/coala,NalinG/coala,JohnS-01/coala,sils1297/coala,arush0311/coala,ManjiriBirajdar/coala,NiklasMM/coala,Balaji2198/coala,dagdaggo/coala,ManjiriBirajdar/coala,CruiseDevice/coala,tushar-rishav/coala,incorrectusername/coala,meetmangukiya/coala,incorrectusername/coala,Uran198/coala,sudheesh001/coala,rresol/coala,svsn2117/coala,RJ722/coala,scriptnull/coala,coala/coala,Shade5/coala,arjunsinghy96/coala,jayvdb/coala,scriptnull/coala,jayvdb/coala,incorrectusername/coala,Asalle/coala,Asalle/coala,saurabhiiit/coala,meetmangukiya/coala,SambitAcharya/coala,mr-karan/coala,AbdealiJK/coala,NiklasMM/coala,swatilodha/coala,SambitAcharya/coala,NalinG/coala,RJ722/coala,vinc456/coala,CruiseDevice/coala,MattAllmendinger/coala,dagdaggo/coala,aptrishu/coala,AbdealiJK/coala,SambitAcharya/coala,sophiavanvalkenburg/coala,scottbelden/coala,karansingh1559/coala,ayushin78/coala,lonewolf07/coala,swatilodha/coala,tltuan/coala,d6e/coala,lonewolf07/coala,AdeshAtole/coala,shreyans800755/coala,damngamerz/coala,NalinG/coala,arush0311/coala,yland/coala,refeed/coala,yland/coala,SanketDG/coala,refeed/coala,rimacone/testing2,tltuan/coala,impmihai/coala,Nosferatul/coala,rimacone/testing2,Balaji2198/coala,netman92/coala,netman92/coala,impmihai/coala,Asnelchristian/coala,kartikeys98/coala,arjunsinghy96/coala,scriptnull/coala,sagark123/coala,kartikeys98/coala,sudheesh001/coala,AdeshAtole/coala,coala-analyzer/coala,scriptnull/coala,RJ722/coala,saurabhiiit/coala,scriptnull/coala,djkonro/coala,Balaji2198/coala,swatilodha/coala,JohnS-01/coala,Nosferatul/coala,Asnelchristian/coala,arush0311/coala,MattAllmendinger/coala,stevemontana1980/coala,shreyans800755/coala,SanketDG/coala,sudheesh001/coala,karansingh1559/coala,Asalle/coala,tushar-rishav/coala,impmihai/coala,abhiroyg/coala,SambitAcharya/coala,scriptnull/coala,dagdaggo/coala,NalinG/coala,sophiavanvalkenburg/coala,shreyans800755/coala,coala/coala,JohnS-01/coala,saurabhiiit/coala,Uran198/coala,yashLadha/coala,MattAllmendinger/coala,djkonro/coala,lonewolf07/coala,NiklasMM/coala,refeed/coala,NalinG/coala,ayushin78/coala,scottbelden/coala,d6e/coala,netman92/coala,coala/coala,yashLadha/coala,ManjiriBirajdar/coala,NalinG/coala,damngamerz/coala,sophiavanvalkenburg/coala,Shade5/coala,aptrishu/coala,nemaniarjun/coala,svsn2117/coala,arjunsinghy96/coala,mr-karan/coala,Asnelchristian/coala,tltuan/coala,AdeshAtole/coala,MariosPanag/coala,scriptnull/coala,Nosferatul/coala,scottbelden/coala,nemaniarjun/coala,ayushin78/coala