Update src/index.ts

Co-Authored-By: Kerrick <me@kerricklong.com>

src/index.ts

@@ -21,7 +21,7 @@ class Talker {
   /*
    * @property timeout - The number of milliseconds to wait before assuming no response will be received.
    */
-  public timeout: number = 3000;
+  public timeoutMs: number = 3000;
 
   /**
    * @property onMessage - Will be called with every non-handshake, non-response message from the remote window