Pin octokit to `~> 4.3.0`
Pin octokit to `~> 4.3.0`

Since version 4.4.0 requires Ruby 2.x.

travis-ci/dpl,travis-ci/dpl,travis-ci/dpl,testfairy/dpl,testfairy/dpl,pengsrc/dpl,computology/dpl,testfairy/dpl