update feather nrf52840 product id

Author: hathach

README.md

@@ -3,7 +3,7 @@
 This repository contains the Arduino BSP for Adafruit nRF52 series:
 
 - [Bluefruit Feather nRF52832](https://www.adafruit.com/product/3406)
-- Bluefruit Feather nRF52840 Express (coming soon)
+- [Bluefruit Feather nRF52840](https://www.adafruit.com/product/4062)
 - [Noric nRF52840DK PCA10056](https://www.nordicsemi.com/eng/Products/nRF52840-DK)
 
 ## BSP Installation

libraries/FileSystem/src/ExternalFS.cpp

@@ -53,7 +53,7 @@ const char README_CONTENT[] =
                               "https://learn.adafruit.com/bluefruit-nrf52-feather-learning-guide\r\n"
                               "\r\n"
                               "Adafruit Bluefruit nRF52 Feather Product Page:\r\n"
-                              "- https://www.adafruit.com/product/0000\r\n";
+                              "- https://www.adafruit.com/product/4062\r\n";
 
 
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