display link to github compare instead of last sha
display link to github compare instead of last sha

perobertson/shipit-engine,perobertson/shipit-engine,Shopify/shipit-engine,perobertson/shipit-engine,perobertson/shipit-engine,Shopify/shipit-engine,Shopify/shipit-engine,perobertson/shipit-engine,Shopify/shipit-engine,Shopify/shipit-engine