minimatch cache key computation seems wrong

[gotwarlost]

  var cacheKey = pattern + "\n" + Object.keys(options).filter(function (k) {
    return options[k]
  }).join(":")

This creates a cachekey with the key names of all truthy options rather than their values (since it is using filter and not map).

Causes issues when two calls have the same pattern but only differ in the value of options.cwd

I guess it should be something like:

  var cacheKey = pattern + "\n" + Object.keys(options).map(function (k) {
    return k + '=' + options[k]
  }).join(":")