Add "Open in MATLAB Online" button.

Author: benjaminkraus

README.md

@@ -1,6 +1,6 @@
 # Spike Raster Plot
 
-[![View Spike Raster Plot on File Exchange](https://www.mathworks.com/matlabcentral/images/matlab-file-exchange.svg)](https://www.mathworks.com/matlabcentral/fileexchange/101884-spike-raster-plot)
+[![View Spike Raster Plot on File Exchange](https://www.mathworks.com/matlabcentral/images/matlab-file-exchange.svg)](https://www.mathworks.com/matlabcentral/fileexchange/101884-spike-raster-plot) [![Open in MATLAB Online](https://www.mathworks.com/images/responsive/global/open-in-matlab-online.svg)](https://matlab.mathworks.com/open/github/v1?repo=MATLAB-Graphics-and-App-Building/spike-raster-plot&file=Example.mlx)
 
 Version: 1.0