update tinyusb, add --recurse-submodules to readme get code

Author: hathach

README.md

@@ -38,7 +38,7 @@ There are two methods that you can use to install this BSP. We highly recommend
   * Linux  : `~/Arduino`
   * Windows: `~/Documents/Arduino`
  4. Create a folder named `hardware/Adafruit`, if it does not exist, and change directories to it
- 5. Clone this repo: `git clone https://github.com/adafruit/Adafruit_nRF52_Arduino.git`
+ 5. Clone this repo & its submodules: `git clone --recurse-submodules https://github.com/adafruit/Adafruit_nRF52_Arduino.git`
  6. Restart the Arduino IDE
  7. Once the BSP is installed, select 'Adafruit Bluefruit nRF52 Feather' from the Tools -> Board menu, which will update your system config to use the right compiler and settings for the nRF52.
 
@@ -76,7 +76,7 @@ To burn the bootloader from within the Arduino IDE, you will need the following
 on your system and available in the system path:
 
 - Segger [JLink Software and Documentation Pack](https://www.segger.com/downloads/jlink)
-- Nordic [nRF5x Command Line Tools](http://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.tools%2Fdita%2Ftools%2Fnrf5x_command_line_tools%2Fnrf5x_installation.html)
+- Nordic [nRF5x Command Line Tools](https://www.nordicsemi.com/Software-and-Tools/Development-Tools/nRF-Command-Line-Tools)
 
 Check to make sure you can run `nrfjprog` from your terminal/command prompt