Ultra assert-expr changes `:actual` value

[Deraen]

Clojure.test built-in assert-expr will set the :actual value as list of the predicate (=) and the values: https://github.com/clojure/clojure/blob/master/src/clj/clojure/test.clj#L450

Ultra just sets the value as list of the values: https://github.com/venantius/ultra/blob/master/src/ultra/test.clj#L22 without the predicate.

This breaks third party reporters like Eftest: weavejester/eftest#67