Update Changelog with latest features
## v0.13.0-dev
+ * New features
+ * Add `require-path-on-device` as another way of detecting which partition
+ is active when running A/B updates. This is only works when updating on
+ device (the usual way of updating).
+ * Add `info()` function for printing out information messages from updates.
+ This is helpful when debugging scripts.
+
## v0.12.1
* Bug fixes
