fix typos, remove unneeded imports

Author: ladyada

README.md

@@ -17,15 +17,15 @@ import adafruit_amg88xx
 The way to create an I2C object depends on the board you are using. For boards with labeled SCL and SDA pins, you can:
 
 ```
-from board import *
+import board
 ```
 
 You can also use pins defined by the onboard microcontroller through the microcontroller.pin module.
 
 Now, to initialize the I2C bus:
 
 ```
-myI2C = busio.I2C(SCL, SDA)
+myI2C = busio.I2C(board.SCL, board.SDA)
 ```
 
 Once you have created the I2C interface object, you can use it to instantiate the AMG88xx object
@@ -45,6 +45,6 @@ amg = adafruit_amg88xx.Adafruit_AMG88xx(myI2C, addr=0x68)
 Pixels can be then be read by doing: 
 
 ```
-value = a.readPixels()
+value = amg.readPixels()
 print(value)
 ```

adafruit_amg88xx.py

@@ -42,10 +42,7 @@ class is inherited by the chip-specific subclasses.
 """
 
 from adafruit_bus_device.i2c_device import I2CDevice
-from adafruit_register import i2c_bit
-from adafruit_register import i2c_bits
-from adafruit_register import i2c_bcd_alarm
-from adafruit_register import i2c_bcd_datetime
+from adafruit_register import i2c_bit, i2c_bints
 
 """
 # AMG88xx default address.