Add vendor and .env to make usable

vendor/phpunit/php-token-stream/tests/_fixture/php-code-coverage-issue-424.php

@@ -0,0 +1,13 @@
+<?php
+
+class Example
+{
+    public function even($numbers)
+    {
+        $numbers = array_filter($numbers, function($number) {
+            return $number % 2 === 0;
+        });
+
+        return array_merge($numbers);
+    }
+}