appveyor: Force pip to use wheels
appveyor: Force pip to use wheels

THe build times on appveyor seem to suggest that pip can't find
the wheels in the local folder. Here, we force pip to file the
local wheels with the `--find-links` arg.

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