Make bors ignore mentions in inline code blocks.

[xFrednet]

Hey, often with delegates you want to let the user know how they can r+ and that they should use r=<name> to approve the PR. An example comment often looks like this:

I'll let you handle the r+ so you don't need to ping me again when CI pass. Please use @bors r=<name> once it's green.

@bors delegate=xFrednet

Example taken from: rust-lang/rust#95542

However, bors seams to only see the r=<name> and approves this while ignoring the delegate command. It would be nice to either ignore mentions in inline code all together or, as a quick workaround, first check for a delegate and if not present approve the PR 🙃