Corrected board name from LIME2.py TO OLIMEX_LIME2.py

diff --git a/src/adafruit_blinka/board/LIME2.py b/src/adafruit_blinka/board/OLIMEX_LIME2.py
similarity index 100%
rename from src/adafruit_blinka/board/LIME2.py
rename to src/adafruit_blinka/board/OLIMEX_LIME2.py