Inconsistency in FFmpeg license statements

[johnthagen]

The README states:

All wheels ship with FFmpeg licensed under the LGPLv2.1.

But the LICENSE-3RD-PARTY states:

https://github.com/skvark/opencv-python/blob/3073e9ee37f016144893deeceb127766f55083dc/LICENSE-3RD-PARTY.txt#L83

Which one of these is correct? Is FFmpeg shipped with Linux and macOS wheels? Since it's LGPL, this has ramifications for those using PyInstaller or PyOxidizer to create a built executable.

[skvark]

All wheels have FFmpeg.

[johnthagen]

@skvark 👍 I have fixed this in #350