phan/phan 2.7.3

Release 2.7.3 supporting PHP 7.0-7.4 syntax

on PHP Packagist

Phan 3 is out (requires PHP 7.2+ to run),
and that release line will contain all of Phan's new features, bug fixes, and crash fixes.

Maintenance:

• Mention that Phan 3 has been released in --help, --version, and crash reports. (#3903)
  The environment variable PHAN_SUPPRESS_PHP_UPGRADE_NOTICE=1 can be set to disable this notice.
• Warn if attempting to execute Phan 2.x with PHP 8.0-dev or newer (A future release of Phan 3 will fully support 8.0)
• Recommend using Phan 3 when --target-php-version or target_php_version is 7.2 or newer.
• Upgrade package versions in composer.lock (affects Phar releases)

Bug fixes:

• Fix handling of windows path separators in phan_client
• Fix a crash when emitting PhanCompatibleAnyReturnTypePHP56 or PhanCompatibleScalarTypePHP56 for methods with no parameters.