docs: use https in the mailing list url

diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
index bb04e2ccca1eb483228ed51684cebbd600e2cd0e..68b948a161ac3af802d7edce28c369ac1fe017aa 100644 (file)
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@@ -4,7 +4,7 @@ We welcome contributions from everyone. However, please follow the following gui
 
 ## Filing Issues
 
-* We use GitHub Issues **exclusively** for tracking **bugs** and **feature** **requests** of systemd. If you are looking for help, please contact our [mailing list](http://lists.freedesktop.org/mailman/listinfo/systemd-devel) instead.
+* We use GitHub Issues **exclusively** for tracking **bugs** and **feature** **requests** of systemd. If you are looking for help, please contact our [mailing list](https://lists.freedesktop.org/mailman/listinfo/systemd-devel) instead.
 * We only track bugs in the **two** **most** **recently** **released** **versions** of systemd in the GitHub Issue tracker. If you are using an older version of systemd, please contact your distribution's bug tracker instead.
 * When filing an issue, specify the **systemd** **version** you are experiencing the issue with. Also, indicate which **distribution** you are using.
 * Please include an explanation how to reproduce the issue you are pointing out.