Update lib/enchance.js

lib/enchance.js

@@ -9,7 +9,7 @@ async function processImageUpscaler({ buffer, method, filenames, mimetype }) {
     let formData = new FormData();
     formData.append("model_version", 1);
 
-    formData.append("image", buffer, {
+    formData.append("image", Buffer.from(buffer), {
       filename: filenames,
       contentType: mimetype,
     });