Honza T. / Distance_HC_SR04

Dependents:   TEST_Dist_lib

Issue: attach_us is depreciated - requires chrono duration, not integer

Error message: 'attach_us' is deprecated: Pass a chrono duration, not an integer microsecond count. For example use `10ms` rather than `10000`. [since mbed-os-6.0.0] [-Wdeprecated-declarations]