update license for inspIRCd

fixes https://github.com/awesome-selfhosted/awesome-selfhosted/issues/2954

README.md

@@ -457,7 +457,7 @@ Mailing lists servers and mass mailing software - one message to many recipients
 - [Dispatch](https://github.com/khlieng/dispatch) - Self-hosted web IRC client written in Go. ([Demo](https://dispatch.khlieng.com/connect)) `MIT` `Go`
 - [Ergo](https://ergo.chat/) - Modern IRCv3 server written in Go, combining the features of an ircd, a services framework, and a bouncer. ([Source Code](https://github.com/ergochat/ergo)) `MIT` `Go`
 - [Glowing Bear](https://github.com/glowing-bear/glowing-bear/) - A web frontend for WeeChat. ([Demo](https://www.glowing-bear.org)) `GPL-3.0` `Javascript`
-- [InspIRCd](https://www.inspircd.org/) - Modular IRC server written in C++ for Linux, BSD, Windows, and macOS. ([Source Code](https://github.com/inspircd/inspircd)) `GFDL-1.2-only` `C++`
+- [InspIRCd](https://www.inspircd.org/) - Modular IRC server written in C++ for Linux, BSD, Windows, and macOS. ([Source Code](https://github.com/inspircd/inspircd)) `GPL-2.0-only` `C++`
 - [Kiwi IRC](https://kiwiirc.com/) - Responsive web IRC client with theming support. ([Demo](https://kiwiirc.com/nextclient/), [Source Code](https://github.com/kiwiirc/kiwiirc)) `Apache-2.0` `Nodejs`
 - [ngircd](https://ngircd.barton.de/) - Free, portable and lightweight Internet Relay Chat server for small or private networks. ([Source Code](https://github.com/ngircd/ngircd)) `GPL-2.0` `C`
 - [Quassel IRC](https://quassel-irc.org/) - distributed IRC client, meaning that one (or multiple) client(s) can attach to and detach from a central core. ([Source Code](https://github.com/quassel/quassel)) `GPL-2.0` `C++`