+* Removed db_uri from LoggingCommandBot (attribute and constructor).
+ Clients that invoke the constructor or expect the attribute to be present
+ will need to be updated to use the value from the config instead.
+* Refactored FeedHistory, allowing for other classes to re-use the history
+ concept in other RSS handlers.
+* Exposed the bot instance as `pmxbot.core._bot` (experimental).