Update lib/converter.js

lib/converter.js

@@ -1,8 +1,8 @@
 import sharp from "sharp";
-const fetch = (await import("node-fetch")).default
+import fetch from "node-fetch";
 
-async function convertWebpToPng(input) {
-  return new Promise((resolve, reject) => {
+function convertWebpToPng(input) {
+  return new Promise(async(resolve, reject) => {
     try {
       if (typeof input === "string") {
         const response = await fetch(input);