Add auto-complete source and setup function

This makes using the package easier for auto-complete users.

Signed-off-by: Eric James Michael Ritz <lobbyjones@gmail.com>
Add info on auto-completion to README.md

Signed-off-by: Eric James Michael Ritz <lobbyjones@gmail.com>
Merge branch 'github/pr/16'

* github/pr/16:
  Add info on auto-completion to README.md
  Add auto-complete source and setup function
Bump the version number to 2.2.0 and update the copyright year

The bump is for the auto-complete integration by Nate Eagleson.