Update dependency django-feed-reader to v2

v2.0.0

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• Feature: Convenience method to get unread posts / mark read when running single user
• Feature: Convenience methods on Subscription to get read and unread posts and mark read
• Feature: Store (optionally) the full parsed feed and items as JSON to allow full access to all features of the feed
• Feature: Keeps old enclosures when url changes
• Feature: Automatically manage subscription count for feeds
• Fix: Insecure connection warning
• Misc: Removed local web proxying as it no longer worked