Update RSS feed URL for existing registration.

[GrahamDumpleton]

After more than 6 years of not posting any blogs, I am resurrecting my blog site and updating it so I can resume posting.

The existing entry registered here for my site is:

[http://blog.dscpl.com.au/feeds/posts/default]
name = Graham Dumpleton

This should be changed to:

[https://grahamdumpleton.me/feed.xml]
name = Graham Dumpleton

No new posts yet, but posts from old site have been migrated to the new site and the old site will eventually redirect all old posts to new site.

Have made sure that RSS feed ignores old posts so people don't get spammed with items for old posts.

Thanks.

[hugovk]

Welcome back! Would you like to open PR to update it?

[GrahamDumpleton]

PR done.