Update CONTRIBUTING.md.

CONTRIBUTING.md

@@ -1,30 +1,18 @@
 # Contributing
 
-Prometheus uses GitHub to manage reviews of pull-requests.
-
-## Getting Started
-
-1. Reach out via our [mailing list](https://groups.google.com/forum/?fromgroups#!forum/prometheus-developers) and ask us what
-   the current priorities are. We can find a good isolated starter project for you.
-
-2. Keeping code hygiene is important.  We thusly have a practical preference
-   for the following:
-
-   1. Run ``make format`` to ensure the correctness of the Go code's layout.
-
-   2. Run ``make advice`` to find facial errors with a static
-      analyzer. In addition, consider running
-      [`golint`](https://github.com/golang/lint).
-
-   3. Try to capture your changes in some form of a test.  Go makes it easy to
-      write [Table Driven Tests](https://code.google.com/p/go-wiki/wiki/TableDrivenTests).
-      There is no mandate to use this said scaffolding mechanism, but it _can_
-      make your life easier in the right circumstances.
-
-   4. Relevant style guidelines are the [Go Code Review
-      Comments](https://code.google.com/p/go-wiki/wiki/CodeReviewComments)
-      and the _Formatting and style_ section of Peter Bourgon's [Go:
-      Best Practices for Production
-      Environments](http://peter.bourgon.org/go-in-production/#formatting-and-style).
-
-3. Welcome aboard!
+Prometheus uses GitHub to manage reviews of pull requests.
+
+* If you have a trivial fix or improvement, go ahead and create a pull
+  request, addressing (with `@...`) one or more of the maintainers
+  (see [AUTHORS.md](AUTHORS.md)) in the description of the pull request.
+
+* If you plan to do something more involved, first discuss your ideas
+  on our [mailing list](https://groups.google.com/forum/?fromgroups#!forum/prometheus-developers).
+  This will avoid unnecessary work and surely give you and us a good deal
+  of inspiration.
+
+* Relevant coding style guidelines are the [Go Code Review
+  Comments](https://code.google.com/p/go-wiki/wiki/CodeReviewComments)
+  and the _Formatting and style_ section of Peter Bourgon's [Go: Best
+  Practices for Production
+  Environments](http://peter.bourgon.org/go-in-production/#formatting-and-style).