Remove no longer useful test compat help

Author: matthiasmullie

tests/bootstrap.php

@@ -1,16 +1,3 @@
 <?php
 
-namespace {
-    require __DIR__.'/../vendor/autoload.php';
-}
-
-namespace PHPUnit\Framework
-{
-    // compatibility for when these tests are run with PHPUnit<6.0 (which we
-    // still do because PHPUnit=6.0 stopped supporting a lot of PHP versions)
-    if (!class_exists('PHPUnit\Framework\TestCase')) {
-        abstract class TestCase extends \PHPUnit_Framework_TestCase
-        {
-        }
-    }
-}
+require __DIR__.'/../vendor/autoload.php';