Simple example Ping Pong from Semtech, updated new lib

Dependencies:   SX1276Lib mbed

Fork of SX1276PingPong by Semtech

i'm using stm32 nucleo l46rg and stm32 nucleo l073 with sx1276mb1mas.

SX1276Lib.lib/shortlog@565259e9e94a: not found in manifest