Remove overview flag echo

Author: bhirsz

robotidy/cli.py

@@ -315,7 +315,6 @@ def cli(
         list_transformers: bool,
         describe_transformer: Optional[str]
 ):
-    click.echo(overwrite)
     if list_transformers:
         transformers = load_transformers(None)
         click.echo('Run --describe-transformer <transformer_name> to get more details. Transformers:')