Bump version to 12.0.0.

[benk-gc]

• Added multi-database support #522
  • This now uses the correct ActiveRecord connection for the model or transition in a multi-database environment

[ameykusurkar]

I think this needs to include something along the lines of: "use the ActiveRecord connection of the transaction class etc", as that is the actual change. The multi-db support is more of a side effect of using the appropriate connection.

Do we need to update any documentation? Eg. any caveats users need to be aware of?

[benk-gc]

Good shout, updated. The usage and interface of statesman should be exactly the same from a model/transition point of view - the only thing that has changed is the connection used when creating and updating transitions. The major version bump is perhaps an overabundance of caution on my part, but I wanted to make sure this couldn't be silently updated if you're relying on something like dependabot.

[ameykusurkar]

Are there any database driver specific changes to behaviour that are worth calling out? If not, this looks good

[benk-gc]

Nope, only internal changes to behaviour detection methods.