update taxcalc to version 0.5.4
update taxcalc to version 0.5.4

zrisher/webapp-public,zrisher/webapp-public,OpenSourcePolicyCenter/PolicyBrain,zrisher/webapp-public,OpenSourcePolicyCenter/webapp-public,OpenSourcePolicyCenter/PolicyBrain,OpenSourcePolicyCenter/webapp-public,OpenSourcePolicyCenter/webapp-public,zrisher/webapp-public,OpenSourcePolicyCenter/webapp-public,OpenSourcePolicyCenter/PolicyBrain,OpenSourcePolicyCenter/PolicyBrain