add uint8_t casts

[bburdette]

I was trying to use this lib with esp32, and got the following errors:

In file included from /home/bburdette/Arduino/libraries/SparkFun_SHTC3_Humidity_and_Temperature_Sensor_Library/src/SparkFun_SHTC3.h:11:0,
                 from /home/bburdette/Arduino/libraries/SparkFun_SHTC3_Humidity_and_Temperature_Sensor_Library/src/SparkFun_SHTC3.cpp:7:
/home/bburdette/.arduino15/packages/automato/hardware/esp32/0.0.1/libraries/Wire/src/Wire.h: In member function 'SHTC3_Status_TypeDef SHTC3::checkID()':
/home/bburdette/.arduino15/packages/automato/hardware/esp32/0.0.1/libraries/Wire/src/Wire.h:103:13: note: candidate 1: uint8_t TwoWire::requestFrom(int, int)
     uint8_t requestFrom(int address, int size);
             ^
/home/bburdette/.arduino15/packages/automato/hardware/esp32/0.0.1/libraries/Wire/src/Wire.h:101:13: note: candidate 2: uint8_t TwoWire::requestFrom(uint8_t, uint8_t)
     uint8_t requestFrom(uint8_t address, uint8_t size);
             ^
/home/bburdette/.arduino15/packages/automato/hardware/esp32/0.0.1/libraries/Wire/src/Wire.h:103:13: note: candidate 1: uint8_t TwoWire::requestFrom(int, int)
     uint8_t requestFrom(int address, int size);
             ^
/home/bburdette/.arduino15/packages/automato/hardware/esp32/0.0.1/libraries/Wire/src/Wire.h:99:13: note: candidate 2: uint8_t TwoWire::requestFrom(uint16_t, uint8_t)
     uint8_t requestFrom(uint16_t address, uint8_t size);
             ^
/home/bburdette/.arduino15/packages/automato/hardware/esp32/0.0.1/libraries/Wire/src/Wire.h: In member function 'SHTC3_Status_TypeDef SHTC3::update()':
/home/bburdette/.arduino15/packages/automato/hardware/esp32/0.0.1/libraries/Wire/src/Wire.h:103:13: note: candidate 1: uint8_t TwoWire::requestFrom(int, int)
     uint8_t requestFrom(int address, int size);
             ^
/home/bburdette/.arduino15/packages/automato/hardware/esp32/0.0.1/libraries/Wire/src/Wire.h:101:13: note: candidate 2: uint8_t TwoWire::requestFrom(uint8_t, uint8_t)
     uint8_t requestFrom(uint8_t address, uint8_t size);
             ^
/home/bburdette/.arduino15/packages/automato/hardware/esp32/0.0.1/libraries/Wire/src/Wire.h:103:13: note: candidate 1: uint8_t TwoWire::requestFrom(int, int)
     uint8_t requestFrom(int address, int size);
             ^
/home/bburdette/.arduino15/packages/automato/hardware/esp32/0.0.1/libraries/Wire/src/Wire.h:99:13: note: candidate 2: uint8_t TwoWire::requestFrom(uint16_t, uint8_t)
     uint8_t requestFrom(uint16_t address, uint8_t size);
             ^
Sketch uses 292998 bytes (22%) of program storage space. Maximum is 1310720 bytes.
Global variables use 14636 bytes (4%) of dynamic memory, leaving 313044 bytes for local variables. Maximum is 327680 bytes.

The problem is the compiler treats SHTC3_ADDR_7BIT as an int, but numBytesRequest is uint8_t. So it wants a version of requestFrom that takes (int, uint8_t) - but there isn't one of those in esp32. There isn't one in AVR either though I haven't tried compiling on that.

At any rate, seems the problem would be solved with a (uin8_t) cast, which I added. Works for me!

[nseidle]

Thanks for the PR fellow Boulderite! Looks good. Merging.