v0.20.0

• List user repositories api (#224)
• Add support for the list outside collaborators endpoint (#225)
• Fix documentation for the list available assignees endpoint (#227)
• Add missing links to issue table of contents (#228)
• Add support for the list available assignees endpoint (#226)
• Missing microsite menu entries + broken link (#229)
• Introduce a way to distinguish different github errors (#230)
• Fix returned type in list branches docs (#235)
• Add support for the list branched endpoint (47deg#231) (#232)
• Update Ruby to latest 2.3.8 for Travis CI (#241)
• Fix decoding of issue when body is null (#236)
• Build upgrade and Release 0.20.0 (#243)
• Add Edit gist api (#240)