ob-clojure: reading `package' header argument from heading properties

* lisp/ob-clojure.el (org-babel-header-arg-names:clojure): Adding
  `package' to the list of Clojure header arguments which will be read
  from heading properties.

lisp/ob-clojure.el

@@ -45,6 +45,7 @@
 (add-to-list 'org-babel-tangle-lang-exts '("clojure" . "clj"))
 
 (defvar org-babel-default-header-args:clojure '())
+(defvar org-babel-header-arg-names:clojure '(package))
 
 (defun org-babel-expand-body:clojure (body params)
   "Expand BODY according to PARAMS, return the expanded body."