Merge branch '3.4' into 4.0

* 3.4:
  [2.7] Fix issues found by PHPStan
  [Command] Fix upgrade guide example
  Add php_unit_dedicate_assert to PHPCS
  [WebProfilerBundle] Let fetch() cast URL to string
  improve FormType::getType exception message details
  [Intl] Update ICU data to 60.2
  [Console] fix a bug when you are passing a default value and passing -n would ouput the index
  [FrameworkBundle] fix merge of 3.3 into 3.4
  bumped Symfony version to 3.4.3
  updated VERSION for 3.4.2
  updated CHANGELOG for 3.4.2

Author: nicolas-grekas

Tests/FilesystemTest.php

@@ -1519,7 +1519,7 @@ public function testAppendToFile()
 
         // skip mode check on Windows
         if ('\\' !== DIRECTORY_SEPARATOR) {
-            $this->assertFilePermissions(664, $filename, 'The written file should keep the same permissions as before.');
+            $this->assertFilePermissions(664, $filename);
             umask($oldMask);
         }
     }