NetNewsWire 6.1.5b2 for Mac

• Restore toggle sidebar button to toolbar
• Add keyboard shortcut for Copy Article URL and Copy External URL menu items
• Fix some Applescript bugs
• Support MarsEdit 5 - it will now appear in Share menu
• Fix a crashing bug that could happen when adding an account
• Remove FeedWrangler support code
• Fix data race with article status (read/unread and starred/unstarred)
• Switch to using built-in URLSession caching — supports Cache-Control response header and other good things — means the app uses less bandwidth and is kinder to the servers it contacts
• Add support for handling 429 responses