update sctp version/check

Author: rainliu

index.html

@@ -106,7 +106,7 @@
           <input type="checkbox" id="srtp" name="srtp" disabled="disabled" checked="checked"> <label for="srtp">SRTP</label>
           <a href="https://crates.io/crates/webrtc-srtp"><img src="https://img.shields.io/crates/v/webrtc-srtp.svg"></a>
           &nbsp;
-          <input type="checkbox" id="sctp" name="sctp" disabled="disabled"> <label for="sctp">SCTP</label>
+          <input type="checkbox" id="sctp" name="sctp" disabled="disabled" checked="checked"> <label for="sctp">SCTP</label>
           <a href="https://crates.io/crates/webrtc-sctp"><img src="https://img.shields.io/crates/v/webrtc-sctp.svg"></a>
           <br>
           <input type="checkbox" id="dtls" name="dtls" disabled="disabled" checked="checked"> <label for="dtls">DTLS</label>