interaction with rails serving .gz files

[jjb]

Thanks for a great project!

the readme says:

Before serving a file from disk to a gzip-enabled client, it will look for a precompressed file in the same location that ends in ".gz". The purpose is to avoid compressing the same file each time it is requested.

I believe rails has done this since 4.2.

• rails/rails@cfaaacd
• rails/rails@8e31fa3

I'm wondering if this project interacts with that behavior appropriately. Might be worth mentioning something in the readme. I can put in a PR for that if the discussion here reveals something interesting.