Update README.md

Author: alvestrand

README.md

@@ -5,7 +5,7 @@ insertion of user-defined processing steps in the pipeline that
 handles media in a WebRTC context.
 
 In order to allow such processing, it defines a number of extensions
-to the objects defined in [WEBRTC-PC](https://w3c.github.io/webrtc-pc/)and
+to the objects defined in [WEBRTC-PC](https://w3c.github.io/webrtc-pc/) and
 draws upon definitions from [WEBRTC-CODEC](https://github.com/WICG/web-codecs).