Made edits to imports per review comments

Author: tekktrik

adafruit_pcf8523.py

@@ -46,13 +46,18 @@ class is inherited by the chip-specific subclasses.
 __version__ = "0.0.0-auto.0"
 __repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_PCF8523.git"
 
-from time import struct_time
 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 busio import I2C
+
+try:
+    import typing  # pylint: disable=unused-import
+    from busio import I2C
+    from time import struct_time
+except ImportError:
+    pass
 
 STANDARD_BATTERY_SWITCHOVER_AND_DETECTION = 0b000
 BATTERY_SWITCHOVER_OFF = 0b111