Update to 0.3.4.
Changelog since 0.3.1:
- 20+ bugfixes in the diff parser and 3 in the tokenizer
- A fuzzer for the diff parser, to give confidence that the diff parser is in a good shape.
- Some bugfixes for f-string
- A fix in iter_errors
- Fix async errors in the diff parser
- Fix an f-string tokenizer error