[Feature Request] Ability to rename email subscriptions

[bustinbung]

New user here. I've been migrating some of my email newsletters to Omnivore, and noticed that some of my newsletters aren't named properly. I know that pulling the newsletter name from the email sender's name works most of the time, but in this case, I wish I was able to rename a newsletter within Omnivore. For example, The Verge's Installer newsletter is named "David Pierce," the author of the newsletter. While this isn't a big deal for now, I can see this becoming confusing in the future.