Fix branch name in scripts/create_release.py

scripts/create_release.py

diff --git a/scripts/create_release.py b/scripts/create_release.py
index 2003031..a7438f2 100755
--- a/scripts/create_release.py
+++ b/scripts/create_release.py
@@ -55,7 +55,7 @@
 
   subprocess.check_call([os.path.join(script_dir, 'update_bazel_workspace.sh')], cwd=root_dir)
 
-  branch_name = 'version_%s' % '_'.join(str(part) for part in new_version)
+  branch_name = 'version_' + new_version
 
   # Create a new git branch
   subprocess.check_call(['git', 'checkout', '-b', branch_name], cwd=root_dir)