fix #15: use "address" keyword for the i2c address

To be consistent with all the other drivers.

Author: deshipu

adafruit_ccs811.py

@@ -95,7 +95,7 @@ class CCS811:
     temp_offset = 0.0
     """Temperature offset."""
 
-    def __init__(self, i2c_bus, addr=0x5A):
+    def __init__(self, i2c_bus, address=0x5A):
         self.i2c_device = I2CDevice(i2c_bus, addr)
 
         #check that the HW id is correct