Add link to related keep-func-props package

[ehmicky]

keep-func-props is a thin wrapper around mimic-fn for the common use case where the "mimicking" happens inside a function wrapper. E.g. for functional helpers like memoize or once.

Instead of:

const mimic = require('mimic-fn')
const memoize = require('lodash/memoize')

const anyFunction = function() { return true }

const memoizedFunction = memoize(anyFunction)
mimic(memoizedFunction, anyFunction)

One can do:

const keepFuncProps = require('keep-func-props')
const memoize = require('lodash/memoize')
const betterMemoize = keepFuncProps(memoize)

const anyFunction = function() { return true }

const memoizedFunction = betterMemoize(anyFunction)