Replace AUTHORS.md by an updated MAINTAINERS.md

Also, note the unmaintained state of the API client in the README.md

AUTHORS.md

@@ -1,11 +0,0 @@
-The Prometheus project was started by Matt T. Proud (emeritus) and
-Julius Volz in 2012.
-
-Maintainers of this repository:
-
-* Björn Rabenstein <beorn@soundcloud.com>
-
-More than [30 individuals][1] have contributed to this repository. Please refer
-to the Git commit log for a complete list.
-
-[1]: https://github.com/prometheus/client_golang/graphs/contributors

CONTRIBUTING.md

@@ -2,9 +2,9 @@
 
 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 have a trivial fix or improvement, go ahead and create a pull request,
+  addressing (with `@...`) the maintainer of this repository (see
+  [MAINTAINERS.md](MAINTAINERS.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).

MAINTAINERS.md

@@ -0,0 +1 @@
+* Björn Rabenstein <beorn@soundcloud.com>

README.md

@@ -30,7 +30,8 @@ The
 [`api/prometheus` directory](https://github.com/prometheus/client_golang/tree/master/api/prometheus)
 contains the client for the
 [Prometheus HTTP API](http://prometheus.io/docs/querying/api/). It allows you
-to write Go applications that query time series data from a Prometheus server.
+to write Go applications that query time series data from a Prometheus
+server. It is still in alpha stage.
 
 ## Where is `model`, `extraction`, and `text`?