feat: add clojure-dart filetype (#356)

Author: D00mch

data/plenary/filetypes/base.lua

@@ -437,6 +437,7 @@ return {
     ['hic'] = [[clojure]],
     ['cljx'] = [[clojure]],
     ['cljs'] = [[clojure]],
+    ['cljd'] = [[clojure]],
     ['json'] = [[json]],
     ['cljc'] = [[clojure]],
     ['pfa'] = [[postscr]],