Change typo and add a link to logged issue.

README.md

@@ -114,10 +114,13 @@ Even with these basic mechanics, there is quite a lot of complexity in creating
  useful.
 
 ## Common/Known Issues
-* If you get an error saying `no module named google.auth` after trying to run `./run.py` or `./run.py -k`, rerun the command again and the dependancy should be detected. This is a logged issue and we are working to solve it.
+* If you get an error saying `no module named google.auth` after trying to run `./run.py` or `./run.py -k`, rerun the command again and the dependency should be detected. This is a [logged issue][auth-issue] and we are working to solve it.
+
+[auth-issue]: https://github.com/ocadotechnology/aimmo/issues/449
 
 ## How to contribute!
 __Want to help?__ You can read the [contributing guidelines][contrib-guidelines]. You can also contact us directly using this [contact form][c4l-contact-form] and we'll get in touch as soon as possible! Thanks a lot.
 
 [c4l-contact-form]: https://www.codeforlife.education/help/#contact
 [contrib-guidelines]: https://github.com/ocadotechnology/aimmo/blob/master/CONTRIBUTING.md
+