Bxcan update

[mryndzionek]

Hello, I would like to use defmt 0.3, but bxcan from this HAL prevents me from doing so:

error: failed to select a version for `defmt`.
    ... required by package `bxcan v0.4.0`
    ... which satisfies dependency `bxcan = ">=0.4, <0.6"` of package `stm32f1xx-hal v0.7.0 (https://github.com/stm32-rs/stm32f1xx-hal?rev=25702c0#25702c0f)`
    ... which satisfies git dependency `stm32f1xx-hal` (locked to 0.7.0)

Would it be possible to upgrade? Latest bxcan is 0.6.2.

[burrbull]

Try #379

[mryndzionek]

👍