update minimal required server version to 3.10.0

This is required to make sure that your server can handle group
permissions per MUCRoom.

src/plugins/restAPI/plugin.xml

@@ -7,7 +7,7 @@
     <author>Roman Soldatow</author>
     <version>1.1.6</version>
     <date>09/24/2015</date>
-    <minServerVersion>3.9.0</minServerVersion>
+    <minServerVersion>3.10.0</minServerVersion>
     
     <adminconsole>		
         <tab id="tab-server">