Use HTTPS protocol for `chat.mibbit.com`

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 3834c54d6c4f72b203463d02dc7fc676ccfc613f..497e4892f700bec1879e32e7d5e710ebac3eeacd 100644 (file)
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -18,7 +18,7 @@ hop on [#rust-internals][pound-rust-internals].
 
 As a reminder, all contributors are expected to follow our [Code of Conduct][coc].
 
-[pound-rust-internals]: http://chat.mibbit.com/?server=irc.mozilla.org&channel=%23rust-internals
+[pound-rust-internals]: https://chat.mibbit.com/?server=irc.mozilla.org&channel=%23rust-internals
 [internals]: https://internals.rust-lang.org
 [coc]: https://www.rust-lang.org/conduct.html