update README.md

Author: midzer

README.md

@@ -68,7 +68,7 @@ CSS: `dist/tobii.min.css`
 JavaScript:
 
 * `dist/tobii.min.js`: IIFE build for maximum browser support, including IE 11
-* `dist/tobii.mjs`: Build specially designed to work in all modern browsers
+* `dist/tobii.modern.js`: Build specially designed to work in all modern browsers
 * `dist/tobii.module.js`: ESM build
 * `dist/tobii.umd.js`: UMD build
 * `dist/tobii.js`: CommonJS/Node build