Merge branch '2.0'

* 2.0:
  Change author's website URL
  Do not require base URL set with Mink
  Add base_url to docs for configuring Mink

src/Driver/SymfonyDriver.php

@@ -10,7 +10,7 @@ use Symfony\Component\HttpKernel\KernelInterface;
 
 final class SymfonyDriver extends BrowserKitDriver
 {
-    public function __construct(KernelInterface $kernel, string $baseUrl)
+    public function __construct(KernelInterface $kernel, ?string $baseUrl)
     {
         if (!$kernel->getContainer()->has('test.client')) {
             throw new \RuntimeException(sprintf(