QA: Apply isort suggestions.

examples/proximity-and-light.py

@@ -1,6 +1,7 @@
 #!/usr/bin/env python
 
 import time
+
 from ltr559 import LTR559
 
 ltr559 = LTR559()

examples/proximity-interrupt.py

@@ -1,8 +1,10 @@
 #!/usr/bin/env python
-from ltr559 import LTR559
 import signal
+
 import RPi.GPIO as GPIO
 
+from ltr559 import LTR559
+
 print("""proximity-interrupt.py - Watch the LTR559 interrupt pin and trigger a function on change.
 
 This script enables the LTR559's interrupt pin and sets up RPi.GPIO to watch it for changes.

ltr559/__init__.py

@@ -1,6 +1,7 @@
 """Library for the LITE-ON LTR559 digital light and proximity sensor."""
 import time
-from i2cdevice import Device, Register, BitField
+
+from i2cdevice import BitField, Device, Register
 from i2cdevice.adapter import Adapter, LookupAdapter, U16ByteSwapAdapter
 
 __version__ = "0.1.1"

tests/conftest.py

@@ -1,7 +1,7 @@
 import sys
+
 import mock
 import pytest
-
 from i2cdevice import MockSMBus