style: pep8 flake8 fixes

Author: ankostis

pycallgraph/output/output.py

@@ -116,7 +116,7 @@ def debug(self, text):
         self.processor.config.log_debug(text)
 
     @classmethod
-    def add_output_file(cls, subparser, defaults, help):
+    def add_output_file(cls, subparser, defaults, help):  # noqa: A002
         subparser.add_argument(
             '-o', '--output-file', type=str, default=defaults.output_file,
             help=help,

pycallgraph/pycallgraph.py

@@ -33,7 +33,7 @@ def __init__(self, output=None, config=None):
     def __enter__(self):
         self.start()
 
-    def __exit__(self, type, value, traceback):
+    def __exit__(self, type, value, traceback):  # noqa: A002
         self.done()
 
     def get_tracer_class(self):

pycallgraph/tracer.py

@@ -372,4 +372,5 @@ def wrapper(*rest):
 
     return wrapper
 
+
 inspect.getmodule = simple_memoize(inspect.getmodule)