v0.30.0

Many thanks to @Saeris, @ariskemper, @mxdvl, @romeerez and @niccholaspage for contributing to this release.

• Add Default and DefaultAsync type and refactor codebase
• Add Fallback and FallbackAsync type and refactor codebase
• Add isOfType type guard util to check the type of an object
• Refactor getDefaults and getDefaultsAsync method (pull request #259)
• Refactor getFallbacks and getFallbacksAsync method (pull request #259)
• Change type definitions from type to interface (pull request #259, #451)
• Remove deprecated properties of safeParse and safeParseAsync method
• Remove any deprecated method, schema and validation functions
• Fix NestedPath type of flatten for async schemas (issue #456)
• Fix implementation of DefaultValue type for transformed values