Add information about buildbots.

Ref: #11779 (comment)

[av skip]

CONTRIBUTING.md

@@ -54,7 +54,9 @@ There are never enough tests. Track [code coverage at Coveralls](https://coveral
 
 3. Write a test that exercises this functionality---you can add your test to one of the existing files, or start a new one, whichever seems most appropriate to you. If you're adding a new test file, make sure you include it in the list of tests in `test/choosetests.jl`. http:https://julia.readthedocs.org/en/latest/stdlib/test/ may be helpful in explaining how the testing infrastructure works. Submit the test as a pull request (see [CONTRIBUTING.md](https://github.com/JuliaLang/julia/blob/master/CONTRIBUTING.md)).
 
-[Issue 9493](https://github.com/JuliaLang/julia/issues/9493) has a more detailed discussion on code coverage.
+* Code for the buildbot configuration is maintained at: https://github.com/staticfloat/julia-buildbot
+* You can see the current buildbot setup at: http:https://buildbot.e.ip.saba.us:8010/builders
+* [Issue 9493](https://github.com/JuliaLang/julia/issues/9493) has a more detailed discussion on code coverage.
 
 ### Improving documentation