Problem: the pull request template is out of date

Solution: Update the pull request template

Author: plexus

docs/pull_request_template.md

@@ -1,13 +1,11 @@
 <!--
-Please write a short description of what your pull request does, as well as describing anything noteworthy about how you approached things.
+This process uses the Collective Code Construction Contract
+https://rfc.zeromq.org/spec:44/C4/
 
-Thank you for submitting a pull request! Someone will review your code, and if it all looks good, it will get merged.
+We merge quickly, but do keep a few things in mind
 
-People are granted commit right after they make a valuable contribution, but this does not mean you can push to master or merge your own commits. It does mean you can review other people's commits, and merge them if they look good.
-
-Please give people a few days to respond. If you don't get any response within a few days, try politely asking people directly. Start with people who have worked on the same files/features, or who generally seem active here. If nobody responds, then ping @plexus :)
+- make small PRs
+- state the problem you are addressing (Problem: ... Solution: ...)
+- add yourself to CONTRIBUTORS.md
+- try not to break the build
 -->
-
-- [ ] My code conforms to this project's [Style Guide](https://github.com/clojureverse/clojurians-log-app/blob/master/docs/STYLE.md)
-- [ ] I have added tests for functions or features I've added
-- [ ] All tests are green (`lein test`)