Release version 0.3.0

Signed-off-by: Philip Withnall <withnall@endlessm.com>

NEWS

@@ -1,3 +1,27 @@
+Overview of changes in malcontent 0.3.0
+=======================================
+
+* API change for getting app filters: use `mct_manager_get_app_filter()` now,
+  rather than `mct_get_app_filter()` (#1, !6)
+
+* Support signalling that a user’s app filter has changed using
+  `MctManager::app-filter-changed` (#1)
+
+* Add a `MCT_APP_FILTER_ERROR_DISABLED` error to distinguish between the app
+  filter not being installed/supported, and temporarily not working (!9)
+
+* Add a top-level header file: use `#include <libmalcontent/malcontent.h>`
+
+* Bugs fixed:
+ - #1 Emit a signal when a user’s parental controls change
+ - !5 docs: Fix NEWS entry
+ - !6 lib: Change allow_interactive_authorization bool to flags
+ - !7 build: Post-release version bump
+ - !8 docs: Expand README to be more informative
+ - !9 libmalcontent: Add MCT_APP_FILTER_ERROR_DISABLED error
+ - !11 libmalcontent: Add a top-level header file
+
+
 Overview of changes in malcontent 0.2.0
 =======================================