Valijson v1.0.4

Issues fixed in this release:

• Prevent potential division by zero (@tyler92)
• Fix stack overflow for unresolved references (@tyler92)
• Fix buffer overflow in u8_strlen (@tyler92)
• Fuzzing improvements (@tyler92)
• Spelling corrections (@jsoref)
• Detect circular references when parsing schemas
• Use statically allocated regexes for date/time pattern matching
• Allow permissive validation of date/time formats