Update README.md to reflect the json file download method

Author: GrumpyOldPizza

README.md

@@ -54,9 +54,9 @@ ArduinoCore-stm32l0 is targeted at ultra low power scenarios, sensor hubs, with
  2. Right-click on ```dpinst_x86.exe``` (32 bit Windows) or ```dpinst_amd64.exe``` (64 bit Windows) and select ```Run as administrator```
  3. Click on ```Install this driver software anyway``` at the ```Windows Security``` popup as the driver is unsigned
 
-###### ST-LINK V2.1 driver setup for NUCLEO boards
+###### ST-LINK V2.1 driver setup for STMicroelectronics boards
 
- 1. Plugin NUCLEO board
+ 1. Plugin STMicroelectronics board
  2. Download and install [ST-Link USB Drivers](http://www.st.com/en/embedded-software/stsw-link009.html)
 
 ### From git