Bugfixes:
* Now metadata resolution is done properly for all transformers.
* Matcher decorators were used in a wrong way and caused a lot of false positives.
* Now contents of the generated `__all__` attribute are lexicographically sorted.
* Some transformers made changes on the `original_node` attribute, which could have led to subtle bugs.
Features:
* New "improvements" added:
* **B005: Replace "A == None" with "A is None"**
* **B006: Remove comparisons with either 'False' or 'True'.**
* Now you can output diff between original and modified code using `--diff` option.