2.20.0

Added option to keep unread or unvisited articles when automatically removing old ones
Added Subscribe item to link context menu in case you find a link to feed that wasn't detected automatically (note: it appears on all links, not only ones leading to feeds)
Improved detection mechanism for YouTube
Improved handling of HTML entities
Cleaned up the look of content pane when no article is selected
Fixed issue causing feed detection to not list detected sources
Reduced size of the package