Can't find autoload.php with other working directory

[erkens]

After upgrade to PHP 7.4 I used your fork instead of the original, but now I got the message that I need to run "composer install".

This is because the autoload locations are incorrect on my system:

$autoloadLocations = [
    getcwd() . '/vendor/autoload.php',
    getcwd() . '/../../autoload.php',
    __DIR__ . '/../vendor/autoload.php',
    __DIR__ . '/../../../autoload.php',
];

But the executable is installed on my system in "vendor/bin/parallel-lint" and autoload.php is located in "vendor/autoload.php". The executable can also be found at "vendor/php-parallel-lint/php-parallel-lint/parallel-lint" but for both instances these locations are not sufficient when the current working dir isn't the source root.

Example:
Source root: /data
CWD: /home/michael

~ $ /data/vendor/bin/parallel-lint
You must set up the project dependencies, run the following commands:
curl -s http://getcomposer.org/installer | php
php composer.phar install

~ $ /data/vendor/php-parallel-lint/php-parallel-lint/parallel-lint 
You must set up the project dependencies, run the following commands:
curl -s http://getcomposer.org/installer | php
php composer.phar install

~ $ cd /data
/data $ /data/vendor/bin/parallel-lint
PHP Parallel Lint version 1.0.0
...

/data $ /data/vendor/php-parallel-lint/php-parallel-lint/parallel-lint 
PHP Parallel Lint version 1.0.0
...

(note: version number is also incorrect in the output)

[grogy]

Merged, thank you for your PR :-)