0.19.0

Breaking changes (😱!!!):

• Deprecate -d flag for deps-only (#712) - instead only support the --deps-only long form
• Switch from -D to -d as shorthand for specifying dependencies within spago repl (#712)

New features:

• Add spago script command. It can be used to run standalone PureScript files as scripts (#712, #724, #683)

Other improvements:

• spago repl will no longer create a (mostly unused) full project skeleton in a temporary directory when a config is not found (#712)
• spago init and spago upgrade-set will now pick the latest set for the available compiler, rathen than just the latest (#721, #687, #657, #666)