Miniflux 2.0.2

• Add support for Let's Encrypt http-01 challenge
• Move template functions outside engine (refactoring)
• Take timezone into consideration when calculating relative time
• Add support for HTTP Strict Transport Security header
• Add support for base URLs with sub-folders
• Add missing about menu in settings
• Show API URL endpoints in user interface
• Do not update entry date while refreshing a feed
• Add flag to toggle debug logging
• Improve unread counter updates