docs (readme): add new text option to documentation

Author: c0nst4ntin

README.md

@@ -123,6 +123,10 @@ By default `peck` will check for a `peck.json` file in your project root. If one
 
 The path to check can be overwritten with the `--path` option. If the path is one you always need checking you can place it in your `peck.json` file.
 
+#### `--text`
+
+The `--text` option allows you to check a string of text for spelling mistakes. This is useful when you want to check a specific string, such as commit messages.
+
 #### `--ignore-all`
 
 This option will ignore all spelling mistakes in the current run. This is useful when you have a large number of mistakes and want to ignore them all at once.