Update ruby-mixlib-config to 3.0.6.
pkgsrc change: add "USE_LANGUAGES= # none".
3.0.6 (2019-12-29)
* Substitute require for require_relative #80 (tas50)
3.0.5 (2019-11-14)
* Add BuildKite PR Testing #75 (tas50)
* Remove Travis PR testing + add foundation team as the project owner #76
(tas50)
* Test on Windows and use the smaller containers #77 (tas50)
* Do not crash when loading undefined context from hash #79 (marcparadise)
3.0.1 (2019-04-23)
* update travis, drop ruby < 2.5, major version bump #73 (lamont-granquist)
* Allow Ruby 2.4 / Update github templates #74 (tas50)
2.2.18 (2018-12-17)
* Add github issue and PR templates #68 (tas50)
* Resolve chefstyle and expeditor issues #69 (tas50)
* Expand ruby testing in Travis #70 (tas50)
* Standardize the gemfile and rakefile #71 (tas50)
* Only ship the required library files in the gem artifact #72 (tas50)
e11adcf769