Copyright Fixes

[northeastprince]

Summary

Just fixed the copyright years, nothing special.

Short checklist

• [X] Did you run bundle exec rubocop -a to fix linter issues?
• [X] If relevant, did you create a test?
• [X] Did you confirm that the RSpec tests pass?

Other Information

If there's anything else that's important and relevant to your pull request, mention that information here.

Thanks for helping improve Capistrano!

No problem :D

[northeastprince]

Ah, just saw #2101.