Please add arduino-managed-serial-device to library manager

[coddingtonbear]

Note This is more of a rename than an add. Could you please add Arduino-Managed-Serial-Device to the library manager?

• https://github.com/coddingtonbear/arduino-managed-serial-device

This replaces the package originally named "arduino-async-duplex".

Cheers

[cmaglie]

Done