[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

git_commits_graph/main.py

@@ -11,6 +11,7 @@
 from git_commits_graph.plotters import plot_total_lines_px
 from tqdm.auto import tqdm
 
+
 @click.command()
 @click.argument("git_dir", required=True)
 @click.option("-b", "--branch", default=None, help="git repository branch to browse.")