FreeDV v1.8.1 released

[Mooneer Salem]

Hi all,

FreeDV 1.8.1 has been released. This contains the following:

1. Bugfixes:
    * Disable 2020B unless the installed Codec2 provides it. (PR #257)
2. Build system:
    * Update build scripts to use specific Codec2 and LPCNet versions. (PR #257)

More information and downloads are at https://github.com/drowe67/freedv-gui/releases/tag/v1.8.1.

Thanks,

-Mooneer K6AQ