Add full command to YoutubedlException

To make debugging easier

classes/exceptions/YoutubedlException.php

@@ -2,9 +2,23 @@
 
 namespace Alltube\Library\Exception;
 
+use Symfony\Component\Process\Process;
+
 /**
  * Generic youtube-dl error.
  */
 class YoutubedlException extends AlltubeLibraryException
 {
+    /**
+     * YoutubedlException constructor.
+     *
+     * @param Process<string> $process Process that caused the exception
+     */
+    public function __construct(Process $process)
+    {
+        parent::__construct(
+            $process->getCommandLine() . ' failed with this error:' . PHP_EOL . trim($process->getErrorOutput()),
+            intval($process->getExitCode())
+        );
+    }
 }