Improve Hash formatting in EnglishPhrasing.list

[reshleman]

We're currently treating all Enumerables as an Array in this method,
resulting in a Hash being formatted as a list of two-element key-value
arrays.

This results in unexpected formatting in the default failure message for
a custom matcher when the expected value is a Hash.

This commit updates EnglishPhrasing.list to no longer format a Hash as
if it were an Array.

Fixes #1192.

Before:

Failure/Error: expect(nil).to custom_match({a: 1, foo: 'bar', bang: Object.new})
  expected nil to custom match [:a, 1], [:foo, "bar"], and [:bang, #<Object:0x00007fb89542bad0>]

After:

Failure/Error: expect(nil).to custom_match({a: 1, foo: 'bar', bang: Object.new})
  expected nil to custom match {:a=>1, :bang=>#<Object:0x00007f9f363b0b28>, :foo=>"bar"}

[pirj]

Looks good!
Nothing seems to be broken, well-aimed shot 👍

[pirj]

Thank you!
You're on the wall of fame now.