v1.2.0

• Fix a race condition when registering new formats. #241
• Improve the performance of uniqueItems. #245
• Fix an issue where integers would be shown as a fraction #248
• Require format to be of type string and formats can now be registered after a schema is parsed. #249
• Improve the handling of true and false schema. #267
• Fix an issue where an invalid schema would cause a panic. #269
• Properly handle file URIs that contain spaces. #272