Yes, if you're hosting that file, you'd be fine, although I might worry about the security of the rest of their architecture (I'm not sure what feedly does, tbh

Yes, if you're hosting that file, you'd be fine, although I might worry about the security of the rest of their architecture (I'm not sure what feedly does, tbh). The one caveat to the above statement is that some places give you a file to host, but it's more or less a script that just document.writes another script tag which loads an external JS file. If that's the case, then you'd still be vulnerable.