support .mjs as es modules and js mime type
node.js decided to use `.mjs` for es modules
and modules are same mime type with `.js`
@@ -41,6 +41,7 @@ MIMEMAP("jpeg", "image/jpeg")
MIMEMAP("jpg", "image/jpeg")
MIMEMAP("jxr", "image/jxr")
MIMEMAP("js", "application/javascript")
+MIMEMAP("mjs", "applicaftion/javascript")
MIMEMAP("json", "application/json")
MIMEMAP("kar", "audio/midi")
MIMEMAP("kml", "application/vnd.google-earth.kml+xml")
