fixing symfony process component changes from v3.3 to v3.4 (#90)

* fixing symfony process component changes from v3.3 to v3.4

* allow multiple attributes to align with symfony update

* psr fixing

Author: yjv-XCV

src/Screens/Phpunit.php

@@ -90,7 +90,7 @@ protected function writeHeader()
 
     protected function runTests()
     {
-        $result = (new Process(["{$this->phpunitBinaryPath} {$this->phpunitArguments}"]))
+        $result = (new Process(array_merge([$this->phpunitBinaryPath], explode(' ', $this->phpunitArguments))))
             ->setTty(true)
             ->run(function ($type, $line) {
                 echo $line;