Merge pull request Z-Hub#95 from matidau/imap-as16

Imap backend 16.1 - Update AS version constant to 16.1

src/backend/imap/imap.php

@@ -1990,7 +1990,7 @@ public function Settings($settings) {
      * @return string       AS version constant
      */
     public function GetSupportedASVersion() {
-        return ZPush::ASV_14;
+        return ZPush::ASV_161;
     }