Releases RSS feed needs to specify encoding in header

[jikamens]

rss2email is reporting this when parsing https://www.thunderbird.net/en-US/thunderbird/releases/atom.xml: "incorrectly declared encoding: document declared as us-ascii, but parsed as utf-8".

The response header for that URL doesn't specify a chracter set:

content-type: text/xml

According to RFC 3023, "In this case, MIME and XML processors MUST assume the charset is "us-ascii"... Omitting the charset parameter is NOT RECOMMENDED for text/xml."

Since there actually are UTF-8 characters in the feed, the correct fix here is for ; charset="utf-8" to be added to the content-type header.

Ref: #264.

[MelissaAutumn]

Thanks for the report! I'll look into this.