Remove dependency on inflight, switch to lru-cache?

[robogeek]

I am getting this warning:

$ npm install
npm WARN deprecated [email protected]: This module is not supported, and leaks memory. Do not use it. Check out lru-cache if you want a good and tested way to coalesce async requests by a key value, which is much more comprehensive and powerful.

My application does not directly depend on inflight, instead it comes from this module:

$ npm ls inflight
[email protected] /home/david/Projects/Evoke-mac/esx-core/server
└─┬ [email protected]
  └─┬ [email protected]
    └─┬ @mark.probst/[email protected]
      └─┬ [email protected]
        └── [email protected]

Further discussion #605