Fixed flake8 error

Author: kmvanbrunt

cmd2/cmd2.py

@@ -449,10 +449,10 @@ def __init__(self, completekey: str = 'tab', stdin=None, stdout=None, *,
                                                 shortcuts=shortcuts)
 
         # Verify commands don't have invalid names (like starting with a shortcut)
-        for cmd in self.get_all_commands():
-            valid, errmsg = self.statement_parser.is_valid_command(cmd)
+        for cur_cmd in self.get_all_commands():
+            valid, errmsg = self.statement_parser.is_valid_command(cur_cmd)
             if not valid:
-                raise ValueError("Invalid command name {!r}: {}".format(cmd, errmsg))
+                raise ValueError("Invalid command name {!r}: {}".format(cur_cmd, errmsg))
 
         # Stores results from the last command run to enable usage of results in a Python script or interactive console
         # Built-in commands don't make use of this.  It is purely there for user-defined commands and convenience.