- class `Application` now closes all windows properly on `Ctrl+C` - class `TreeItem` can be constructed without arguments. - Now depends on PyQt5 < 5.15 as workaround for 7
1.3.0
- enhanced class `Worker` (added event `started`, providing traceback on event `failed`) - various bug fixes
1.2.0
- enhanced class `Worker` - added setter for property `current` (classes `Tree` and `Table`) - various bug fixes