Append information to post URL (e.g. UTM source)

[SeanKilleen]

I'm willing to contribute this feature but wanted to write it up first.

Use case: I'm using Fathom Analytics on my blog. I think a lot of my traffic is being driven from RSS readers, but it's hard to tell because they show up as direct traffic.

I'd really like the ability to append something like ?utm_source=RSS to the URLs in the feed so that they'll correctly show up in my analytics.

I think this would entail:

• Configuration for hard-coded text to append (presumably we'd include the ? and strip it off if a user adds it)
• Updating the XML template to include the string if set, and otherwise include nothing
• Appropriate tests
• Docs update

It seems like a straightforward addition but before embarking I wanted to ensure this project was still up for receiving contributions and that this one is a fit.

[SeanKilleen]

@parkr are you interested in this? If so, I'll get on it; otherwise I'll close it out.