Add support for Symfony 5 to process runner

Brought up in #98.

src/Shell/Shell.php

@@ -2,14 +2,15 @@
 
 namespace Studio\Shell;
 
+use ReflectionClass;
 use RuntimeException;
 use Symfony\Component\Process\Process;
 
 class Shell
 {
     public static function run($task, $directory = null)
     {
-        $process = new Process("$task", $directory);
+        $process = static::makeProcess($task, $directory);
         $process->setTimeout(3600);
 
         $process->run();
@@ -22,4 +23,17 @@ public static function run($task, $directory = null)
 
         return $process->getOutput();
     }
+
+    private function makeProcess($task, $directory)
+    {
+        $reflection = new ReflectionClass(Process::class);
+        $params = $reflection->getConstructor()->getParameters();
+        $type = $params[0]->getType();
+
+        if ($type && $type->getName() === 'array') { // Symfony 5
+            return new Process(explode(' ', $task), $directory);
+        } else { // Older versions
+            return new Process($task, $directory);
+        }
+    }
 }