Update appcast.xml for 0.9.73
Update appcast.xml for 0.9.73

CommandPost/CommandPost-App,asmagill/hammerspoon,Habbie/hammerspoon,cmsj/hammerspoon,cmsj/hammerspoon,Hammerspoon/hammerspoon,Hammerspoon/hammerspoon,asmagill/hammerspoon,Habbie/hammerspoon,latenitefilms/hammerspoon,latenitefilms/hammerspoon,Habbie/hammerspoon,asmagill/hammerspoon,Habbie/hammerspoon,Habbie/hammerspoon,cmsj/hammerspoon,latenitefilms/hammerspoon,CommandPost/CommandPost-App,latenitefilms/hammerspoon,asmagill/hammerspoon,Hammerspoon/hammerspoon,asmagill/hammerspoon,cmsj/hammerspoon,CommandPost/CommandPost-App,Hammerspoon/hammerspoon,cmsj/hammerspoon,latenitefilms/hammerspoon,cmsj/hammerspoon,CommandPost/CommandPost-App,Hammerspoon/hammerspoon,asmagill/hammerspoon,Habbie/hammerspoon,latenitefilms/hammerspoon,Hammerspoon/hammerspoon,CommandPost/CommandPost-App,CommandPost/CommandPost-App