Avoid using Buffer global in bencode (#386)

* Use node prefix for buffer

* don't use buffer

* fix

Author: borkdude

src/nbb/impl/bencode.cljs

@@ -59,7 +59,7 @@
 (defn read-bencode [string] (first (decode string)))
 
 (defn utf8-bytes [s]
-  (.-length (js/Buffer.from s)))
+  (.-length (.encode (new js/TextEncoder) s)))
 
 (defn encode [data]
   (cond