document issue #177 about overriding default sort order

[kagahd]

The feature to override the default sort order was not yet documented, so I added it.

[bpatrik]

Thank you. The documentation part of the app is not that clean :/
I could not figure out for a long time. Lately I try to make the app self documented and keep all the options in the app. (i.e.: documentations like this should show app in the app eventually). Like I will add a popup in the settings around sorting that would show the same text.