PSR-16 cache-key not compatible with all implementations

[dochne]

Issue summary

The PSR specification does not list hyphens as necessarily accepted in cache keys. Trying to use many of the common libraries (such as cache/filesystem-adapter) causes an error due to the use of hyphens in the cache key.

System informations

(In case of a bug report Please complete the table below)

Information	Description
Pdp version	5.1.0
PHP version	7.1
OS Platform	Mac

Standalone code, or other way to reproduce the problem

composer require cache/filesystem-adapter

<?php

include("vendor/autoload.php");

$hostname = "https://foo.example.com";
$filesystemAdapter = new \League\Flysystem\Adapter\Local(__DIR__."./");
$filesystem = new \League\Flysystem\Filesystem($filesystemAdapter);
$cacheInterface = new \Cache\Adapter\Filesystem\FilesystemCachePool($filesystem);

$client = new class implements \Pdp\HttpClient {
    public function getContent(string $url): string
    {
        return file_get_contents($url);
    }
};

$manager = new \Pdp\Manager($cacheInterface, $client);
$rules = $manager->getRules();
$domain = $rules->resolve($hostname);
var_dump($domain->getRegistrableDomain());

Expected result

string(11) "example.com"

Actual result

PHP Fatal error:  Uncaught Cache\Adapter\Common\Exception\InvalidArgumentException: Invalid key "PSL-FULL-5a3cc7f81795bb2e48e848af42d287b4". Valid filenames must match [a-zA-Z0-9_\.! ]. in .../vendor/cache/filesystem-adapter/FilesystemCachePool.php:145

[nyamsprod]

This issue is fix using #214 thanks for catching the issue and providing the patch to solve it 👍