Update README.md

Updated licensing

README.md

@@ -25,7 +25,7 @@ It is exclusively designed for use on Intel-based MacBooks. The current version
 
 ## Citing and Re-using Course Material
 
-All content in this repository is licensed under the <a rel="license" href="https://creativecommons.org/licenses/by-nc-sa/4.0/">Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)</a>. <a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons Licence" style="border-width:0" src="https://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png" /></a><br /> 
+All course data in these repositories are licensed under the <a rel="license" href="https://creativecommons.org/licenses/by-nc-sa/4.0/">Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)</a>. <a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons Licence" style="border-width:0" src="https://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png" /></a><br /> 
 The course data is free to reuse and adapt with appropriate attribution.
 
 ## Intrested in attending a course?