Suggest using ‘(boolean? x)’ instead of ‘(or (true? x) (false? x))’ on Clojure 1.9 and later

[glts]

Clojure 1.9 introduced the predicate boolean?.

In Clojure 1.9 and later (boolean? x) replaces the older idiom (or (true? x) (false? x)).

Please consider adding a rule that suggests this change. Thank you!