Pull from transifex

OpenKeychain/src/main/res/raw-zh/help_changelog.md

@@ -1,5 +1,8 @@
 [//]: # (注意：请把每个句子放在单独一行中， Transifex 将把每一行放置在独立的翻译表单内！)
 
+## 4.6
+  * Import your keys using our new Secure Wifi Transfer mechanism
+
 ## 4.5
   * Detailed description for security problems
   * Display keyserver status per key