UnexpectedValueException: Expecting a version number in the format x.y

[AndreyMZ]

Steps to reproduce

1. Set phpVersion to "5.1" in the configuration file.
2. Run Psalm.

Actual result

Uncaught UnexpectedValueException: Expecting a version number in the format x.y in /opt/psalm/vendor/vimeo/psalm/src/Psalm/Internal/Analyzer/ProjectAnalyzer.php:1174
Stack trace:
#0 /opt/psalm/vendor/vimeo/psalm/src/Psalm/Internal/CliUtils.php(500): Psalm\Internal\Analyzer\ProjectAnalyzer->setPhpVersion('5.1', 'config')
#1 /opt/psalm/vendor/vimeo/psalm/src/Psalm/Internal/Cli/Psalm.php(349): Psalm\Internal\CliUtils::initPhpVersion(Array, Object(Psalm\Config), Object(Psalm\Internal\Analyzer\ProjectAnalyzer))
#2 /opt/psalm/vendor/vimeo/psalm/psalm(9): Psalm\Internal\Cli\Psalm::run(Array)
#3 /opt/psalm/vendor/bin/psalm(119): include('/opt/psalm/vend...')
#4 {main}
(Psalm 5.11.0@c9b192ab8400fdaf04b2b13d110575adc879aa90 crashed due to an uncaught Throwable)

Expected result

1. No uncaught exception, no stack trace.
2. Correct error message telling that PHP 5.1 specified in the configuration file ".xml" is not supported by Psalm, and only PHP 5.4-5.6, 7.0-7.4, 8.0-8.2 are supported.

Root cause

psalm/src/Psalm/Internal/Analyzer/ProjectAnalyzer.php

Lines 1182 to 1184 in dc81630

	if (!preg_match('/^(5\.[456]|7\.[01234]|8\.[012])(\..*)?$/', $version)) {
	throw new UnexpectedValueException('Expecting a version number in the format x.y');
	}

Additional information

The error message is also wrong because actually version numbers in the formats x.y.z (e.g. "8.2.8") are also expected.

[weirdan]

Feel free to PR.