Clarify the location where the ruby is missing

[creitve]

For the Issue #73

[capistrano-bot]

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[creitve]

Also please tell me if you do want to see the changelog updated with this^

[mattbrictson]

Hi, thanks for creating this PR! Yes, I think a CHANGELOG entry is warranted here.

Also, I think the warning could be improved even further by including the host name. The host is passed to every on block, so you can do it like this:

# Notice the additional `host` argument
on release_roles(fetch(:rbenv_roles)) do |host|
  # ...
  warn "rbenv: #{rbenv_ruby} is not installed or not found in #{fetch(:rbenv_ruby_dir)} on #{host}"

[creitve]

Thanks for your help! I hope that this will suffice.

[mattbrictson]

Looks good, thanks! 🙇