Update index.html

Author: Rain

index.html

@@ -67,7 +67,8 @@
               href="https://deps.rs/repo/github/webrtc-rs/webrtc"><img
                 src="https://deps.rs/repo/github/webrtc-rs/webrtc/status.svg"></a> <a
               href="https://crates.io/crates/webrtc"><img src="https://img.shields.io/crates/v/webrtc.svg"></a> <a
-              href="https://docs.rs/webrtc"><img src="https://docs.rs/webrtc/badge.svg"></a> <a><img 
+              href="https://docs.rs/webrtc"><img src="https://docs.rs/webrtc/badge.svg"></a> <a
+              href="https://doc.rust-lang.org/1.6.0/complement-project-faq.html#why-dual-mitasl2-license"><img 
                 src="https://img.shields.io/badge/license-MIT%2FApache--2.0-blue" alt="License: MIT/Apache 2.0"></a> <a
               href="https://discord.gg/4Ju8UHdXMs"><img
                 src="https://img.shields.io/discord/800204819540869120?logo=discord" alt="Discord"></a> <a