fix for UNIQUE_TEST_TOKEN
#157 fixes the UNIQUE_TEST_TOKEN generation.
With 0.12.0, it was possible that some tokens generated in series were generated at the same ms and thus, had the same uniqid.
#157 fixes the UNIQUE_TEST_TOKEN generation.
With 0.12.0, it was possible that some tokens generated in series were generated at the same ms and thus, had the same uniqid.