3.1.5-mod.1

What's Changed

Synced with upstream objection v3.1.5

And a few extra modifications:

• static query hooks fixes: modelOptions in DelegateOperation should forward to the one from the delegated operation, resolve modelOptions.old properly for graph operations by @falkenhawk in #18
• typings: make idColumn array readonly by @falkenhawk in #19

Full Changelog: 3.0.4-mod.1...3.1.5-mod.1