Arduino LMIC library updated

Thanks for making this available. Unfortunately I get a compiling error like this:

In function 'u4_t hal_ticks()':
D:\Addy\Documenten\Arduino\libraries\arduino-lmic-master\src\hal\hal.cpp:154:115: error: 'static_assert' was not declared in this scope
static_assert(US_PER_OSTICK_EXPONENT > 0 && US_PER_OSTICK_EXPONENT < 8, "Invalid US_PER_OSTICK_EXPONENT value");

What is wrong here?

Thanks is advance for your answer.