Mailing list retirement

[Jason Evans]

This mailing list is now retired, as part of consolidating all project management on GitHub.  The issues facility (https://github.com/jemalloc/jemalloc/issues) will now be used for all public communication, as documented in the "Project activity" section of the primary website, which is now at:

	http://jemalloc.net/

Note that the mailing list archives will remain available, currently at:

	http://jemalloc.net/mailman/jemalloc-discuss/index.html

Our communication has increasingly taken place on GitHub over the past couple of years, so for the most part this merely finalizes the transition.  I hope this will not be a burden for any of you, and I look forward to your ongoing collaboration.

Thanks,
Jason