Update ruby-mixlib-log to 3.0.8.
3.0.8 (2019-12-30)
* Expand testing / Update GitHub templates #51 (tas50)
* Add Build Kite PR Testing #52 (tas50)
* Remove Travis PR Testing #53 (tas50)
* Resolve all warnings emitted during testing #54 (zenspider)
* Add windows testing in Buildkite #56 (tas50)
* Test on Ruby 2.7 + random testing improvements #58 (tas50)
* Substitute require for require_relative #59 (tas50)
3.0.1 (2019-01-05)
* reverting back to ruby 2.3 support #48 (lamont-granquist)
3.0.0 (2019-01-04)
* update travis, drop ruby < 2.5, major version bump #47 (lamont-granquist)
2.0.9 (2018-12-18)
* remove hashrocket syntax #41 (lamont-granquist)
* Remove the changelog generator gem #42 (tas50)
* Test on all the Ruby versions we support #43 (tas50)
* Test on Ruby 2.6 in Travis + test on Xenial #46 (tas50)
* Only ship the required library files in the gem artifact #45 (tas50)
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