We remove the call to readSince() as some feeds push new articles with
pubDate prior to the lastModified time stored for these feeds (e.g.
lemonde.fr). As we go through all items of a feed again and again, we
prevent the constant update of an item's lastModified timestamp by
keeping the previous one if its fingerprint does not change.
Fixes#921
Signed-off-by: Kevin Decherf <kevin@kdecherf.com>
