When access from: https://github.com/AY1920S1-CS2113T-W13-1/main URL lead to an empty UserGuide: https://github.com/AY1920S1-CS2113T-W13-1/main/blob/master/docs/UserGuide.adoc 
When access from:
https://github.com/AY1920S1-CS2113T-W13-1/main
URL lead to an empty UserGuide:
https://github.com/AY1920S1-CS2113T-W13-1/main/blob/master/docs/UserGuide.adoc