Ability to see the diff between commits

[rudolfheszele]

Is your feature request related to a problem? Please describe.
I would like to have a way to see the diff between two commits.

Describe the solution you'd like
In other GUIs it is usually doable by ctrl+click on the commits and then all the changed files can be seen with their diff.
Some similar functionality would be great to have in Gitnuro too.