[LICENSE] Is this project GPLv3, or LGPLv2.1?

[b-]

The original https://github.com/scogswell/ArduinoSerialCommand/ is licensed under GNU LGPLv2.1, though it's not very prominent. (I have submitted a Pull Request to fix this...)

The LGPLv2.1 requires that modifications be distributed under the same terms (§2(c) of the GNU Lesser General Public License, version 2.1)

The GPLv3 is actually a lot more restrictive, so I (and I am not a lawyer) do not know if it's compatible. However, I do know it's also completely legal for scogswell to license the library to you under GPLv3 anyway.

As someone who has a fork of this repo, I'm merely requesting this clarification for the sake of clarity, so I can add the appropriate LICENSE file to my own repository.

Speaking of LICENSE files, adding one to the root of your repository will allow GitHub to prominently display the license of the project along the top. You can add it with just a few clicks by going to https://choosealicense.com/licenses/

Thank you!