Update README.md

Author: developit

README.md

@@ -236,9 +236,9 @@ module.exports = {
       async function asyncify() { return this.apply(null, arguments); }
       module.exports = function() {
         const w = require(${JSON.stringify(filename.replace(/^.+!/, ''))});
-	const m = {};
-	for (let i in w) m[i] = asyncify.bind(w[i]);
-	return m;
+        const m = {};
+        for (let i in w) m[i] = asyncify.bind(w[i]);
+        return m;
       };
     `;
   }