added clojurescript set! kwd

Author: humasect

clojure-mode.el

@@ -336,7 +336,7 @@ elements of a def* forms."
                               "defalias" "defhinted" "defmacro-"
                               "defn-memo" "defnk" "defonce-"
                               "defstruct-" "defunbound" "defunbound-"
-                              "defvar" "defvar-" "var"))
+                              "defvar" "defvar-" "var" "set!"))
                 ;; Function declarations.
                 "\\)\\>"
                 ;; Any whitespace