change mongo logging policy to upsert (update by default, insert if new)

lib/logging/mongodb.rb

@@ -92,7 +92,7 @@ def out(target, status, results)
     else
       Helper::utf8_elements!(foo) # convert foo to utf-8
       flatten_elements!(foo)
-      @coll.insert_one(foo)
+      @coll.replace_one({ target: foo[:target]}, foo, { upsert: true})
     end
   end
 end