adjust espnow channel range

examples/wifi/espnow/main/Kconfig.projbuild

@@ -27,7 +27,7 @@ menu "Example Configuration"
     config ESPNOW_CHANNEL
         int "Channel"
         default 1
-        range 1 13
+        range 0 14
         help
             The channel on which sending and receiving ESPNOW data.