update testBuildMail with broken te

apparently email containing \n\n in body makes Zend\Mail crash with exception:

  'Malformed header detected'

Author: glensc

Diff for: tests/Mail/MimeDecodeTest.php

@@ -148,7 +148,7 @@ public function testBuildMail()
         $to = '';
         $cc = '';
         $subject = 'söme messidž';
-        $body = 'bödi tekst';
+        $body = "Hello, bödi tekst\n\nBye\n";
         $in_reply_to = '';
         $iaf_ids = [];