Update README.md

Author: pgleeson

README.md

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-# L23 Pyramidal Cell Tutorial
+# L2/3 Pyramidal Cell Tutorial
 
 A tutorial introducing OSB's ability to visualise, analyse and simulate biophysically realistic, multicompartmental cells.
 
 Uses a detailed Layer 2/3 Pyramidal cell from the [Blue Brain Project Neocortical Microcircuit model](https://bbp.epfl.ch/nmc-portal/microcircuit) as an example. 
 
 To follow this tutorial, please click [here](http://www.opensourcebrain.org/projects/l23pyramidalcelltutorial/models?explorer=https%253A%252F%252Fraw.githubusercontent.com%252FOpenSourceBrain%252FL23PyramidalCellTutorial%252Fmaster%252FNeuroML2%252FosbSessions%252FGEPPETTO.json).
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+[![Build Status](https://travis-ci.org/OpenSourceBrain/L23PyramidalCellTutorial.svg?branch=master)](https://travis-ci.org/OpenSourceBrain/L23PyramidalCellTutorial)