clojure-sort-ns does not handle forms like :gen-class #527

Expected behavior

clojure-sort-ns should handle the whole ns form, including :gen-class.

Actual behavior

clojure-sort-ns chokes on forms like :gen-class.

Steps to reproduce the problem

Create a .clj file w/ the following ns form:

(ns foo
  (:gen-class
   :methods [[methodOne [] String]
             [methodTwo [] String]]
   :init init))

Run clojure-sort-ns and see that the form is mangled:

(ns foo
  (:gen-class
   :methods [[methodOne [] String]
             :init init
             [methodTwo [] String]]))

Environment & Version information

clojure-mode version information

20190105.1043

Emacs version

26.1

Operating system

Fedora 28