refactor: black formatting changes

Author: jpgrayson

vcd/__init__.py

@@ -7,6 +7,7 @@
     ~vcd.reader.tokenize
 
 """
+
 from .reader import tokenize
 from .writer import VCDPhaseError, VCDWriter
 

vcd/gtkw.py

@@ -11,6 +11,7 @@
 __ http://gtkwave.sourceforge.net
 
 """
+
 import datetime
 import math
 import os

vcd/writer.py

@@ -3,6 +3,7 @@
 This module provides :class:`VCDWriter` for writing VCD files.
 
 """
+
 from datetime import datetime
 from itertools import zip_longest
 from numbers import Number