Update plaeform.txt to reflect the proper platform name

Author: GrumpyOldPizza

platform.txt

@@ -17,7 +17,7 @@
 # For more info:
 # https://github.com/arduino/Arduino/wiki/Arduino-IDE-1.5---3rd-party-Hardware-specification
 
-name=stm32l0
+name=Tlera Corp STM32L0 (32-bits ARM Cortex-M0+) Boards
 version=1.6.18
 
 # Compile variables