Alias :throw-exceptions with :throw-exceptions?

I always get caught putting a question mark at the end, so here's an alias.

If this is cool, I'd like to deprecate `:throw-exceptions` and update the README.

It seemed odd that the wrap-redirects middleware didn't depend on the fact that the default value of `:throw-exception` is true, which is why `throws-excpetions?` cannot be used there. I'm not sure it's a problem, though.