Change serial communication: use two stop bits

Robotito/src/main.c

@@ -70,7 +70,7 @@ static void init_uart(void)
         .baud_rate = 9600,
         .data_bits = UART_DATA_8_BITS,
         .parity = UART_PARITY_DISABLE,
-        .stop_bits = UART_STOP_BITS_1,
+        .stop_bits = UART_STOP_BITS_2,
         .flow_ctrl = UART_HW_FLOWCTRL_DISABLE,
         .source_clk = UART_SCLK_APB,
     };