Add Copyright statement to --help (needed as it has the license info)

htop.c

@@ -35,6 +35,7 @@ static void printVersionFlag(void) {
 
 static void printHelpFlag(void) {
    fputs("htop " VERSION "\n"
+         COPYRIGHT "\n"
          "Released under the GNU GPLv2.\n\n"
          "-C --no-color               Use a monochrome color scheme\n"
          "-d --delay=DELAY            Set the delay between updates, in tenths of seconds\n"