Modify create_prediction()

[Xakka]

Pull request summary

The list outcomes must contain a minimum of 2 choices and up to a maximum of 10 choices.

Checklist

• [x] If code changes were made then they have been tested.
  • [x] I have updated the documentation to reflect the changes.
  • [ ] I have updated the changelog with a quick recap of my changes.
• [x] This PR fixes an issue.
• [ ] This PR adds something new (e.g. new method or parameters).
• [x] This PR is a breaking change (e.g. methods or parameters removed/renamed)
• [ ] This PR is not a code change (e.g. documentation, README, ...)

[chillymosh]

This is a breaking change and in the current state won't be accepted. In order for this to be acceptable you need to not change the original behaviour and add to it in a reasonable design.