move conversion rate calculation to calculateConversionRate
move conversion rate calculation to calculateConversionRate

calculate conversionRate in ScoreBreakdown

NebulousLabs/Sia,ChrisSchinnerl/Sia,MrStrong/Sia,ChrisSchinnerl/Sia,mharkus/Sia,mtlynch/Sia,ericflo/Sia,ericflo/Sia,mtlynch/Sia,MrStrong/Sia,mharkus/Sia,NebulousLabs/Sia