Use black with -l 120 param.

gns3server/version.py

@@ -29,6 +29,7 @@ if "dev" in __version__:
     try:
         import os
         import subprocess
+
         if os.path.exists(os.path.join(os.path.dirname(os.path.abspath(__file__)), "..", ".git")):
             r = subprocess.check_output(["git", "rev-parse", "--short", "HEAD"]).decode().strip()
             __version__ = f"{__version__}-{r}"