improve logging for DC_EVENT_CONNECTIVITY_CHANGED

DcCore/DcCore/DC/events.swift

@@ -227,7 +227,7 @@ public class DcEventHandler {
             }
 
         case DC_EVENT_CONNECTIVITY_CHANGED:
-            dcContext.logger?.info("network: DC_EVENT_CONNECTIVITY_CHANGED")
+            dcContext.logger?.info("network: DC_EVENT_CONNECTIVITY_CHANGED: \(dcContext.getConnectivity())")
             DispatchQueue.main.async {
                 let nc = NotificationCenter.default
                 nc.post(