full diff: https://github.com/xeipuuv/gojsonschema/compare/v1.1.0...v1.2.0
- Fix a race condition when registering new formats.
- Improve the performance of uniqueItems.
- Fix an issue where integers would be shown as a fraction
- Require format to be of type string and formats can now be registered after a schema is parsed.
- Improve the handling of true and false schema.
- Fix an issue where an invalid schema would cause a panic.
- Properly handle file URIs that contain spaces.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>