[Feature request] Export and import of subscriptions list

Exporting and importing the subscriptions list is a useful feature. In my case I want to update the app from version 1.1.0 (from F-droid) to 1.1.1 (from git) but the app won't update because of the different origin. I must uninstall the old version before installing the new version, but doing so will delete all my preferences, including the list of subscribed subreddits (and it's not easy searching and adding them one by one when you have a lot of subscriptions).