bring Characteristic JSON in line with spec

 * events is actually called ev
 * there is no bonjour field

Author: ccutrer

src/main/java/com/beowulfe/hap/characteristics/BaseCharacteristic.java

@@ -97,8 +97,7 @@ protected CompletableFuture<JsonObjectBuilder> makeBuilder(int instanceId) {
                       .add("type", type)
                       .add("perms", perms.build())
                       .add("format", format)
-                      .add("events", false)
-                      .add("bonjour", false)
+                      .add("ev", false)
                       .add("description", description);
               setJsonValue(builder, value);
               return builder;