Allow multiple --rss-url to be passed, source aggregation
Allow multiple --rss-url to be passed, source aggregation

Allow multiple --rss-url to be passed and aggregate all news under one
source(handle) and cache file.
The idea is to aggregate multiple RSS streams from one site into one cache file
and get rid of duplication since one news article might be published accross
multiple RSS streams. However, site must support this. Sadly, for example ZDNet
doesn't support this and assigns unique URLs to the same article published
through multiple RSS streams.

zstyblik/rss2irc