release I2C bus after sending read command

Wire::endTransmission() has an optional argument that
defines whether the bus is released or not. At the time
of writing the library, we set it to hold the bus. This
causes issues on other platforms.

Author: winkj

SHTSensor.cpp

@@ -67,7 +67,7 @@ bool SHTI2cSensor::readFromI2c(uint8_t i2cAddress,
     }
   }
 
-  if (Wire.endTransmission(false) != 0) {
+  if (Wire.endTransmission() != 0) {
     return false;
   }