add catch_all documentation

Author: DannyBen

README.md

@@ -196,19 +196,19 @@ The `bashly.yml` configuration file consists of these types:
 Unless otherwise specified, these definitiona can be used for both the root
 command and subcommands (under the `commands` definition).
 
-
  Option    | Description
 -----------|-------------
 `name`     | The name of the script or subcommand.
 `short`    | An additional, optional pattern - usually used to denote a one letter variation of the command name. You can add `*` as a suffix, to denote a "starts with" pattern - for example `short: m*`. *Applicable only in subcommands*.
 `help`     | The header text to display when using `--help`. This option can have multiple lines. In this case, the first line will be used as summary wherever appropriate.
 `version`  | The string to display when using `--version`. *Applicable only in the main command*.
-`default`  | Setting this to `yes` on any command, will make unrecognized command line arguments to be passed to this command. *Applicable only in subcommands*.
+`default`  | Setting this to `true` on any command, will make unrecognized command line arguments to be passed to this command. *Applicable only in subcommands*.
 `examples` | Specify an array of examples to show when using `--help`. Each example can have multiple lines.
 `environment_variables` | Specify an array of environment variables needed by your script. 
 `commands` | Specify the array of commands. Each command will have its own args and flags. Note: if `commands` is provided, you cannot specify flags or args at the same level.
 `args`     | Specify the array of positional arguments this script needs.
 `flags`    | Specify the array of option flags this script needs.
+`catch_all` | Specify that this command should allow for additional arbitrary arguments or flags. It can be set in one of three ways:<br>- Set to `true` to just enable it.<br>- Set to a string, to use this string in the usage help text.<br>- Set to a hash containing `label` and `help` keys, to show a detailed help for it when running with `--help`.
 `dependencies` | Specify an array of any required external dependencies (commands). The script execution will be halted with a friendly error unless all dependency commands exist.
 `group`    | In case you have many commands, use this option to specify a caption to display before this command. This option is purely for display purposes, and needs to be specified only for the first command in each group.