[ANN] Clojars now requires a license in the POM for new projects or projects that already specify a license

I just deployed a change that requires licenses for all releases (as promised above, though I did release it a few days early).

I also updated the wiki to cover this change, and linked to @seancorfield’s next-jdbc build.clj example to show tools.build usage.

Let me know if you see any issues when deploying!