Prepare for 6.2-1.16.1 release.

CHANGELOG.md

-# Changes in version 6.2-1.16.? - 2018-08-??
+# Changes in version 6.2-1.16.1 - 2018-08-13
 
  * Medium changes
    - Fix JSON serialization of history objects.

build.xml

@@ -10,7 +10,7 @@
   <property name="implementation-title" value="Onionoo" />
   <property name="onionoo.protocol.version" value="6.2"/>
   <property name="release.version"
-            value="${onionoo.protocol.version}-1.16.0-dev"/>
+            value="${onionoo.protocol.version}-1.16.1"/>
   <property name="metricslibversion" value="2.4.0"/>
   <property name="jetty.version" value="-9.2.21.v20170120" />
   <property name="warfile"