Update submodule libcanard to latest Mon Feb  8 00:39:43 UTC 2021
Update submodule libcanard to latest Mon Feb  8 00:39:43 UTC 2021

    - libcanard in PX4/Firmware (fef2f1c150ee15ba430c2da74fb432483fd888d8): https://github/commit/cde670347425023480a1417fcd603b27c8eb06c1
    - libcanard current upstream: https://github/commit/55938c51cf7da3096679933302693c9dae7a2b33
    - Changes: https://github/compare/cde670347425023480a1417fcd603b27c8eb06c1...55938c51cf7da3096679933302693c9dae7a2b33

    55938c5 2020-12-29 Pavel Kirienko - Merge pull request #160 from UAVCAN/readme-fix
1c91c49 2020-12-29 Pavel Kirienko - Improve the example in README, fix #159

acfloria/Firmware,acfloria/Firmware,acfloria/Firmware,acfloria/Firmware,acfloria/Firmware,acfloria/Firmware,acfloria/Firmware