Slic3r
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Change IRC server from freenode.net to libera.chat
This change alters the .github/CONTRIBUTING.md file to use the new IRC server.
:white_check_mark: Build Slic3r 1.3.0-master-2495 completed (commit https://github.com/slic3r/Slic3r/commit/d8cc8d30b2 by @dwillmore)