Compiler Warning

[matthias-bs]

Hi,

I am using this library in a CI (Continuous Integration) workflow. Depending on the compiler settings, some types of warnings are treated as errors. Thus I get the following error:

/home/runner/Arduino/libraries/DistanceSensor_A02YYUW/DistanceSensor_A02YYUW.cpp: In member function 'DistanceSensor_A02YYUW_MEASSUREMENT_STATUS DistanceSensor_A02YYUW::meassure()':
/home/runner/Arduino/libraries/DistanceSensor_A02YYUW/DistanceSensor_A02YYUW.cpp:15:17: error: unused variable 'startTime' [-Werror=unused-variable]
   unsigned long startTime = millis();
                 ^~~~~~~~~
/home/runner/Arduino/libraries/DistanceSensor_A02YYUW/DistanceSensor_A02YYUW.cpp: In member function 'void DistanceSensor_A02YYUW::_flushSerialInput()':
/home/runner/Arduino/libraries/DistanceSensor_A02YYUW/DistanceSensor_A02YYUW.cpp:74:17: error: unused variable 'startTime' [-Werror=unused-variable]
   unsigned long startTime = millis();
                 ^~~~~~~~~
cc1plus: some warnings being treated as errors

Should be easy to fix...

Best regards
Matthias