fixed first example

cli/README.MD

@@ -50,7 +50,7 @@ SingleFile can be launched from the command line by running it into a (headless)
 
   - Dump the processed content of https://www.wikipedia.org into the console
 
-  `single-file https://www.wikipedia.org`
+  `single-file https://www.wikipedia.org` --filename-template=""
 
   - Save https://www.wikipedia.org into `wikipedia.html`