Move kown issue info to tail of readme

Author: asukiaaa

README.md

@@ -2,22 +2,6 @@
 
 A library to use xbox controller on ESP32.
 
-## Known issue.
-
-The following error occurs on ESP32.
-```
-lld_pdu_get_tx_flush_nb HCI packet count mismatch (1, 2)
-```
-
-It does not occur on ESP32C3 (may be also S3) because BLE5 may be needed to communicate with xbox controller.
-If you want to use this library without the error, please use ESP32 which supports BLE5.
-
-Related issues:
-- [Connection is not the first time](https://github.com/asukiaaa/arduino-XboxSeriesXControllerESP32/issues/3)
-- [BLE service discovery fails on low BLE connections](https://github.com/espressif/esp-idf/issues/8303)
-- [Request of some advice to solve lld_pdu_get_tx_flush_nb HCI packet count mismatch (1, 2)](https://github.com/h2zero/NimBLE-Arduino/issues/293)
-- [Reset scanning state without resetting esp32](https://github.com/h2zero/NimBLE-Arduino/issues/417)
-
 ## Update firmware of controller
 
 This libary is checked with firmware version `5.13.3143.0` for xbox series X controller.
@@ -45,6 +29,22 @@ See [examples](./examples).
 
 If you want to make receiver of Xbox controller, write [firmware about xbox controller](https://github.com/asukiaaa/arduino-ControllerAsI2c/blob/main/examples/slave_target/esp32/wireless-xbox-series-x/wireless-xbox-series-x.ino) to ESP32 then use it by [ControllerAsI2c_asukiaaa](https://github.com/asukiaaa/arduino-ControllerAsI2c) library from other IC via I2C connection.
 
+## Known issue.
+
+The following error occurs on ESP32.
+```
+lld_pdu_get_tx_flush_nb HCI packet count mismatch (1, 2)
+```
+
+It does not occur on ESP32C3 (may be also S3) because BLE5 may be needed to communicate with xbox controller.
+If you want to use this library without the error, please use ESP32 which supports BLE5.
+
+Related issues:
+- [Connection is not the first time](https://github.com/asukiaaa/arduino-XboxSeriesXControllerESP32/issues/3)
+- [BLE service discovery fails on low BLE connections](https://github.com/espressif/esp-idf/issues/8303)
+- [Request of some advice to solve lld_pdu_get_tx_flush_nb HCI packet count mismatch (1, 2)](https://github.com/h2zero/NimBLE-Arduino/issues/293)
+- [Reset scanning state without resetting esp32](https://github.com/h2zero/NimBLE-Arduino/issues/417)
+
 ## License
 
 MIT