Update the copy a bit, drop official IE support

Author: dead-claudia

README.md

@@ -15,11 +15,11 @@
 
 ## What is Mithril.js?
 
-A modern client-side JavaScript framework for building Single Page Applications. It's small (<!-- size -->9.12 KB<!-- /size --> gzipped), fast and provides routing and XHR utilities out of the box.
+A modern client-side JavaScript framework for web applications big and small. It's small (<!-- size -->9.12 KB<!-- /size --> gzipped), fast, and highly stable. And it offers utilities for routing, state management, and more right out of the box.
 
-Mithril.js is used by companies like Vimeo and Nike, and open source platforms like Lichess 👍.
+Mithril.js has been used by companies like Vimeo, Nike, and Amazon, and open source platforms like Lichess. 👍
 
-Mithril.js supports IE11, Firefox ESR, and the last two versions of Firefox, Edge, Safari, and Chrome. No polyfills required. 👌
+Mithril.js supports Firefox ESR and the last two versions of Firefox, Edge, Safari, and Chrome. No polyfills required. 👌
 
 ## Installation