Merge branch '3.4' into 4.0

* 3.4:
  Add color support for Hyper terminal .
  [HttpFoundation] Fix tests: new message for status 425
  [Doctrine Bridge] Fixed usage of wrong variable when tagged subscriber is invalid
  [PropertyInfo] added handling of nullable types in PhpDoc
  [HttpKernel] Make AbstractTestSessionListener compatible with CookieClearingLogoutHandler
  [Cache] provider does not respect option maxIdLength with versioning enabled

DeprecationErrorHandler.php

@@ -316,7 +316,8 @@ private static function hasColorSupport()
                 && sapi_windows_vt100_support(STDOUT))
                 || false !== getenv('ANSICON')
                 || 'ON' === getenv('ConEmuANSI')
-                || 'xterm' === getenv('TERM');
+                || 'xterm' === getenv('TERM')
+                || 'Hyper' === getenv('TERM_PROGRAM');
         }
 
         if (function_exists('stream_isatty')) {