releasing version 0.8.16~exp7

debian/changelog

@@ -1,4 +1,4 @@
-apt (0.8.16~exp7) UNRELEASEDexperimental; urgency=low
+apt (0.8.16~exp7) experimental; urgency=low
 
   [ David Kalnischkies ]
   * do not pollute namespace in the headers with using (Closes: #500198)