revised format command in test

Author: kanin-kearpimy

spy/tests/test_cli.py

@@ -353,7 +353,7 @@ def test_fmt_file(self):
         )
         f = self.write("ugly.spy", mod)
 
-        self.run("fmt", f)
+        self.run("format", f)
         expected = textwrap.dedent(
             """def main() -> None:
     print("hello world")