v0.12.1

What's Changed

• Decode array and object example values to JSON text, clarify the ExampleValue contract (#295) @adamw
• Represent null example values as null, drop null defaults and examples (#294) @adamw
• Update sbt to 2.0.11 (#291) @softwaremill-ci
• Keep string defaults and examples as strings, and keep null const and default (#293) @adamw
• Decode example values to the Scala values used in code (#292) @adamw