index: apparently buildbot is gone, link to travis ci instead

diff --git a/index.mdwn b/index.mdwn
index 875012b83ecfc27dc05affa968e78f8039206724..c1b20e08c900f97fa98ff1888a5cbe2f4af0ecbd 100644 (file)
--- a/index.mdwn
+++ b/index.mdwn
@@ -164,9 +164,7 @@ made to Notmuch and the notmuchmail.org web site. [The Notmuch OpenHub project
 page](https://www.openhub.net/p/notmuch) has a nice summary of the codebase and
 activity.
 
-We have a [buildbot](http://buildbot.notmuchmail.org/grid) (here's
-its
-[configuration](https://github.com/tomprince/buildbot-configs/tree/notmuch)).
+Continuous integration build and test suite status: [![Build Status](https://travis-ci.org/notmuch/notmuch.svg?branch=master)](https://travis-ci.org/notmuch/notmuch)
 
 Contributions, such as patches, to Notmuch are most welcome. Please refer to the
 [[guide to contributing|contributing]].