fix: corrected those filenames

Author: mfranzke

README.md

@@ -42,14 +42,8 @@ You may optionally load via NPM or Bower:
 Include one of the provided JavaScript files depending on your setup plus the CSS file:
 
 ```html
-<link
-	rel="stylesheet"
-	href="dist/loading-attribute-polyfill-with-serviceworker.css"
-/>
-<script
-	src="dist/loading-attribute-polyfill-with-serviceworker.js"
-	async
-></script>
+<link rel="stylesheet" href="dist/loading-attribute-polyfill.css" />
+<script src="dist/loading-attribute-polyfill.js" async></script>
 ```
 
 or e.g. within JS