add link to travis build

README.md

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-ABOUT
-==========
+#ABOUT [![Build Status](https://travis-ci.org/danmarsden/moodle-mod_attendance.svg?branch=master)](https://travis-ci.org/danmarsden/moodle-mod_attendance)
+
 The Attendance module is supported and maintained by Dan Marsden http://danmarsden.com
 
 The Attendance module was previously developed by
     Dmitry Pupinin, Novosibirsk, Russia,
     Artem Andreev, Taganrog, Russia.
 
-PURPOSE
-==========
+#PURPOSE
 The Attendance module allows teachers to maintain a record of attendance, replacing or supplementing a paper-based attendance register.
 It is primarily used in blended-learning environments where students are required to attend classes, lectures and tutorials and allows
 the teacher to track and optionally provide a grade for the students attendance.