V6 decision: rename "/Middlewares" to "/Middleware"?

[drbyte]

While it's a little trivial, the "plural" use of "Middlewares" as the namespace/directory for Middleware has always bugged me.

It's a breaking change to rename it. But V6 is the time to handle breaking-changes.
Granted, it's not "complicated" to address while upgrading.

But it's also harmless to leave as-is.

Thoughts?