Update lib/converter.js

lib/converter.js

@@ -6,7 +6,7 @@ function convertWebpToPng(input) {
     try {
       if (typeof input === "string") {
         const response = await fetch(input);
-        const images = await response.buffer();
+        const images = await response.arrayBuffer();
         const converting = await sharp(images);
         const converted = converting.toFormat('png').png({ quality: 90 }).toBuffer();
         resolve(converted);