When notification is clicked, item isn't marked as read.

[Alpvax]

Follow up to #88, which works perfectly.
If I click on an issue directly from the android notification, the issue isn't marked as read (again, using OctoDroid to actually view the issues).

[velias]

Android notification fires github view URL directly, so GH::watch is not activated in this use case in any way for now. Implementing this feature would mean that GH::watch activity has to be called from the notification to mark it as read, then redirect to the final view URL.

[Alpvax]

Ah ok, that's fair enough. It's not a big issue.