Remove more references to temperature property

[caternuson]

Hopefully found them all. All the stuff in adafruit_ccs811.py is fine. Removed other mentions from README.rst and setup.py.

~/Adafruit_CircuitPython_CCS811$ grep -i -r "temperature" *
adafruit_ccs811.py:    """Temperature offset."""
adafruit_ccs811.py:    def temperature(self):
adafruit_ccs811.py:        Temperature based on optional thermistor in Celsius."""
adafruit_ccs811.py:    def set_environmental_data(self, humidity, temperature):
adafruit_ccs811.py:        """Set the temperature and humidity used when computing eCO2 and TVOC values.
adafruit_ccs811.py:        :param float temperature: The current temperature in Celsius."""
adafruit_ccs811.py:        # Temperature is stored as an unsigned 16 bits integer in 1/512 degrees
adafruit_ccs811.py:        # 0x00. As an example 23.5% temperature would be 0x61, 0x00.
adafruit_ccs811.py:        temperature = int((temperature + 25) * 512)
adafruit_ccs811.py:        struct.pack_into(">HH", buf, 1, humidity, temperature)
README.rst:To read the gas sensor and temperature simply read the attributes:
README.rst:    print("CO2: ", ccs.eco2, " TVOC:", ccs.tvoc, " temp:", ccs.temperature)
setup.py:    keywords='adafruit air quality voc eco2 temperature breakout hardware micropython circuitpython',