Replace argparse with RichHelpFormatter for CLI

Author: tdiprima

pyupgradecheck/cli.py

@@ -1,14 +1,14 @@
-import argparse
 import json
 import time
 
 from halo import Halo
+from rich_argparse import RichHelpFormatter
 
 from .checker import check_environment, get_installed_packages, parse_requirements_file
 
 
 def main():
-    p = argparse.ArgumentParser(
+    p = RichHelpFormatter.make_rich_parser(
         prog="pyupgradecheck",
         description="Check installed packages for Python version compatibility.",
     )