[JEX-608] Use Expeditor to bump version and trigger release build

[schisamo]

This change updates this repo to begin using the following standard behavior from Expeditor following a merge to the master branch:

• Automatically bump the PATCH version in the VERSION file (see https://git.io/vQQYR)
• Create a git tag for the new version (see https://git.io/vQQYR)
• Trigger a release build on manhattan.ci.chef.co using the new tag (see https://git.io/vQQY1)
• Automatically update CHANGELOG (coming soon...the built_in:update_changelog merge action is in development)

More details on Expeditor can be found at: https://github.com/chef/es-lita/tree/master/lita-expeditor

Signed-off-by: Seth Chisamore schisamo@chef.io

[schisamo]

/cc @chef/jex-team @chef/sustaining-eng-team

[schisamo]

I'll merge this once we have a new release of Expeditor with CHANGELOG support fully deployed.