SimplePie: bug date CEST

https://github.com/marienfressinaud/FreshRSS/issues/659
https://github.com/simplepie/simplepie/pull/380

lib/SimplePie/SimplePie/Parse/Date.php

@@ -331,6 +331,7 @@ class SimplePie_Parse_Date
 		'CCT' => 23400,
 		'CDT' => -18000,
 		'CEDT' => 7200,
+		'CEST' => 7200,	//FreshRSS
 		'CET' => 3600,
 		'CGST' => -7200,
 		'CGT' => -10800,