v1.1.1: Update dependencies and other minor changes

Shouldn't be much of significance changing in this version. Mostly the
dependencies have been updated.

v1.1.0: Improvements to output text, build with vgo

- New output format:
  - Confusing message about .dockerignore removed.
  - Explicitly show information about how much has been affected by .dockerignore.
  - Console updates sent to stderr, so that stdout can be piped to a file and diff'd.

- Update internals to use latest docker packages.

- Drop vendor dependencies.

v1.0: First release

Straight to 1.0! It's simple and it works.

Feel free to prove me wrong and send bug reports :)