Removing freenode from README

It seems that by setting the /topic in freenode #googlebenchmark to point to libera I have angered the powers that be and we've been locked out of the channel. Libera it is then.

Removing freenode from README
0e1255af · Dominic Hamon · GitHub · db2de74c · 0e1255af
Unverified Commit 0e1255af authored May 28, 2021 by Dominic Hamon Committed by GitHub May 28, 2021
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@@ -39,7 +39,6 @@ as some of the structural aspects of the APIs are similar.
 [Discussion group](https://groups.google.com/d/forum/benchmark-discuss)

 IRC channels:
-* [freenode](https://freenode.net) #googlebenchmark
 * [libera](https://libera.chat) #benchmark

 [Additional Tooling Documentation](docs/tools.md)