Merge pull request #18 on github from phillbush/message-deleted-not-in-cache along with an option to configure the new behaviour


move "Message id ... deleted not in cache" into logger
TelegramServ can get filled with warnings like
Message id 012345 deleted not in cache
if you are in a channel/group that automatically deletes messages after
a certain time, and the deleted message is not in cache.

Warn that in the logger.
With "info" severity, because that's not actually an issue, just
something that can happen.

Add option "log_deleted" to enable this, by default false (use TelegramServ)