Yes. It's in reference to at least 3 requests for proxy support (mine included). Although, I am not sure if the others require proxy username and password support - it would be trivial for me to add, but I cannot validate as I don't require that functionality at the moment.
General
[ ] Update Changelog following the conventions laid out on Keep A Changelog
[X] Update README with any necessary configuration snippets
[ ] Binstubs are created if needed
[ ] RuboCop passes
[ ] Existing tests pass
New Plugins
[ ] Tests
[ ] Add the plugin to the README
[ ] Does it have a complete header as outlined here
Pull Request Checklist
Is this in reference to an existing issue?
General
[ ] Update Changelog following the conventions laid out on Keep A Changelog
[X] Update README with any necessary configuration snippets
[ ] Binstubs are created if needed
[ ] RuboCop passes
[ ] Existing tests pass
New Plugins
[ ] Tests
[ ] Add the plugin to the README
[ ] Does it have a complete header as outlined here
Purpose
Known Compatibility Issues