Fix Plagger runtime with p5-XML-Feed>=0.55
Index: lib/Plagger/FeedParser.pm
--- lib/Plagger/FeedParser.pm.orig
+++ lib/Plagger/FeedParser.pm
@@ -4,8 +4,8 @@ use strict;
 use Feed::Find;
 use XML::Atom;
 use XML::Feed;
-use XML::Feed::RSS;
-$XML::Feed::RSS::PREFERRED_PARSER = "XML::RSS::LibXML";
+use XML::Feed::Format::RSS;
+$XML::Feed::Format::RSS::PREFERRED_PARSER = "XML::RSS::LibXML";
 $XML::Atom::ForceUnicode = 1;
 
 use Plagger::Util;