composer.json update

#220 Schema update.
#216 Docs

Return types annotations

See #209

Support for PHP 7.4

See #203

Improve empty domain checks

#201

README updates and style improvements

Fixed

• #200
• #197
• #198

Fix MultipleValidationWithAnd with ALLOW_ALL_ERRORS

Fixed
#179
#186

Dev mode Autoloader

See #178

Fix isValid when strict = false

See #172

INTL support checks

• #173 Add fallback for when INTL_IDNA_VARIANT_UTS46 is not supported (@tomsommer)
• #174 Correctly check for intl extension in SpoofCheck (@tomsommer)
• #175 DNSCheckValidation requires the Intl extension (@tomsommer)

Convert domains to unicode before checking DNS

DNS check should convert unicode domains first (#166)

* fix checkdnsrr not handling unicode domains properly

* fix for php7.2