Merge pull request #88 from nate/patch-1

Update email address

Housekeeping

Version bump

Update Gemfile.lock

Version bump

Fixing markdown lint errors

Update my email address

Update bundler and rake versions

Drop Ruby 2.3

Update ruby version support.

Update gemspec to fix deprecation warning.

Fix broken test on Ruby 2

Update Gemfile.lock

Update README format + add new contributors