Is possible rateLimit by host

[magicbrighter]

Is it possible to separate host rate limit, so as not to have pressure on a single machine, and makes the overall high

[stevenvachon]

Not currently, but a PR is welcome.

[stevenvachon]

This would also be useful for maxSocketsPerHost, where one host could be unlimited while the rest are limited.

[stevenvachon]

This will be in the next major version as an option override in enqueue().