Missing message for negative failures

[kimroen]

If you use the matchers with a negative assertion and the spec fails, you get this error instead of the expected test failure:

NoMethodError:
       undefined method `failure_message_when_negated' for #<JSONAPI::Resources::Matchers::HaveAttribute:0x00007f95870f3420>
       Did you mean?  failure_message

Example of a test that triggers this issue:

it { is_expected.not_to have_attribute :password }