[Modify] Rename it

websocket-sharp/Net/AuthenticationResponse.cs

@@ -75,7 +75,7 @@ namespace WebSocketSharp.Net
       uint nonceCount)
       : base (scheme, parameters)
     {
-      Parameters["username"] = credentials.UserName;
+      Parameters["username"] = credentials.Username;
       Parameters["password"] = credentials.Password;
       Parameters["uri"] = credentials.Domain;
       _nonceCount = nonceCount;

websocket-sharp/Net/NetworkCredential.cs

@@ -194,7 +194,7 @@ namespace WebSocketSharp.Net
     /// <value>
     /// A <see cref="string"/> that represents the username.
     /// </value>
-    public string UserName {
+    public string Username {
       get {
         return _username;
       }