v5.9.0

GitHub v5.9.0

Diff since v5.8.2

Merged pull requests:

• Simplify usage of Content/Blob's base64-encoded data. (#209) (@maleadt)
• Update README.md to remove TravisCI (#213) (@logankilpatrick)
• Update README.md to add releases (#214) (@logankilpatrick)
• Replace broken pubkey test with new key (#217) (@Keno)
• add way to get org members (#218) (@IanButterworth)
• create_repo: params should be a keyword argument (#219) (@fredrikekre)