Temperatures over 42.5 C are coming back as negative

[mshannon78660]

Temperatures higher than 42.5 degress C (108.5 degrees F) are coming back as very large negative numbers. I think this is due to line 198 (

Adafruit_CircuitPython_SHTC3/adafruit_shtc3.py

Line 198 in 8e0fea8

raw_temp = unpack_from(">h", temp_data)[0]

) unpacking the measurement as a signed short - I think it should be unsigned, just like with relative humidity. So that line would change from
raw_temp = unpack_from(">h", temp_data)[0]
to
raw_temp = unpack_from(">H", temp_data)[0]

In the next line, we're already subtracting 4500 from the value, which is how we get to negative temperatures. Looking at the Arduino library, it looks like they use the value as unsigned:
https://github.com/adafruit/Adafruit_SHTC3/blob/8d48fd2708027c0f943743077f3fbae8b51a9f29/Adafruit_SHTC3.cpp#L159

[ladyada]

kk can you submit a PR please :)