echo.c:

Corrected GPL to be version 2 only


client/echo.c:
  Corrected GPL to be version 2 only

client/echo.c

@@ -2,8 +2,7 @@
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2 of the License, or
-   (at your option) any later version.
+   the Free Software Foundation; version 2 of the License.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of