[Modify] Remove websocket.org URLs

websocket.org no longer available. Many thanks to websocket.org

Example/Program.cs

@@ -18,9 +18,7 @@ namespace Example
       // If you would like to connect to the server with the secure connection,
       // you should create a new instance with a wss scheme WebSocket URL.
 
-      using (var ws = new WebSocket ("ws://echo.websocket.org"))
+      using (var ws = new WebSocket ("ws://localhost:4649/Echo"))
-      //using (var ws = new WebSocket ("wss://echo.websocket.org"))
-      //using (var ws = new WebSocket ("ws://localhost:4649/Echo"))
       //using (var ws = new WebSocket ("wss://localhost:5963/Echo"))
       //using (var ws = new WebSocket ("ws://localhost:4649/Chat"))
       //using (var ws = new WebSocket ("wss://localhost:5963/Chat"))

README.md

@@ -649,7 +649,7 @@ Examples using websocket-sharp.
 
 ### Example ###
 
-[Example] connects to the [Echo server].
+[Example] connects to the server executed by [Example2] or [Example3].
 
 ### Example2 ###
 
@@ -679,7 +679,6 @@ Thanks for translating to japanese.
 websocket-sharp is provided under [The MIT License].
 
 
-[Echo server]: http://www.websocket.org/echo.html
 [Example]: https://github.com/sta/websocket-sharp/tree/master/Example
 [Example2]: https://github.com/sta/websocket-sharp/tree/master/Example2
 [Example3]: https://github.com/sta/websocket-sharp/tree/master/Example3