warning: parser/current is loading parser/ruby24, which recognizes
warning: 2.4.5-compliant syntax, but you are running 2.4.4.
warning: please see https://github.com/whitequark/parser#compatibility-with-ruby-mri.
/Users/kyle/.rvm/gems/ruby-2.4.4@diaspora/gems/pronto-0.9.5/lib/pronto/git/repository.rb:80:in `merge_base': revspec 'upstream/develop' not found (Rugged::ReferenceError)
	from /Users/kyle/.rvm/gems/ruby-2.4.4@diaspora/gems/pronto-0.9.5/lib/pronto/git/repository.rb:80:in `merge_base'
	from /Users/kyle/.rvm/gems/ruby-2.4.4@diaspora/gems/pronto-0.9.5/lib/pronto/git/repository.rb:17:in `diff'
	from /Users/kyle/.rvm/gems/ruby-2.4.4@diaspora/gems/pronto-0.9.5/lib/pronto.rb:62:in `run'
	from /Users/kyle/.rvm/gems/ruby-2.4.4@diaspora/gems/pronto-0.9.5/lib/pronto/cli.rb:61:in `block in run'
	from /Users/kyle/.rvm/gems/ruby-2.4.4@diaspora/gems/pronto-0.9.5/lib/pronto/cli.rb:60:in `chdir'
	from /Users/kyle/.rvm/gems/ruby-2.4.4@diaspora/gems/pronto-0.9.5/lib/pronto/cli.rb:60:in `run'
	from /Users/kyle/.rvm/gems/ruby-2.4.4@diaspora/gems/thor-0.19.4/lib/thor/command.rb:27:in `run'
	from /Users/kyle/.rvm/gems/ruby-2.4.4@diaspora/gems/thor-0.19.4/lib/thor/invocation.rb:126:in `invoke_command'
	from /Users/kyle/.rvm/gems/ruby-2.4.4@diaspora/gems/thor-0.19.4/lib/thor.rb:369:in `dispatch'
	from /Users/kyle/.rvm/gems/ruby-2.4.4@diaspora/gems/thor-0.19.4/lib/thor/base.rb:444:in `start'
	from /Users/kyle/.rvm/gems/ruby-2.4.4@diaspora/gems/pronto-0.9.5/bin/pronto:6:in `<top (required)>'
	from bin/pronto:16:in `load'
	from bin/pronto:16:in `<main>'