Update README.md

Author: pgleeson

README.md

@@ -4,6 +4,6 @@ A tutorial introducing OSB's ability to visualise, analyse and simulate biophysi
 
 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).
+**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).**
 
 [![Build Status](https://travis-ci.org/OpenSourceBrain/L23PyramidalCellTutorial.svg?branch=master)](https://travis-ci.org/OpenSourceBrain/L23PyramidalCellTutorial)