v1.0.0-beta.13

Many thanks to @andersk, @EltonLobo07, @xcfox, @Bilboramix, @genki, @ivands, @bachmacintosh, @sandros94, @Hugos68 and @typed-sigterm for contributing to this release.

See discussion #1022 and issue #983 for more details and context on this release.

• Add exactOptional and exactOptionalAsync schema (PR #1013)
• Change validation of missing object entries in looseObject, looseObjectAsync, object, objectAsync, objectWithRest, objectWithRestAsync, strictObject and strictObject (PR #1013)
• Change type signature of optional and optionalAsync when used within an object schema (PR #1013)