Reformat the source code using black

Change-Id: I54e7f6b9a60e4caa42158bf6259c671bc800e4a8
diff --git a/setup.cfg b/setup.cfg
new file mode 100644
index 0000000..3f13854
--- /dev/null
+++ b/setup.cfg
@@ -0,0 +1,2 @@
+[flake8]
+max_line_length = 100