docs: improve why usePrettierrc option is needed

close #506

README.md

@@ -139,7 +139,7 @@ If you’re fixing large of amounts of previously unformatted code, consider tem
 
   - An object with the following options
 
-    - `usePrettierrc`: Enables loading of the Prettier configuration file, (default: `true`). May be useful if you are using multiple tools that conflict with each other, or do not wish to mix your ESLint settings with your Prettier configuration.
+    - `usePrettierrc`: Enables loading of the Prettier configuration file, (default: `true`). May be useful if you are using multiple tools that conflict with each other, or do not wish to mix your ESLint settings with your Prettier configuration. And also, it is possible to run prettier without loading the prettierrc config file [via the CLI's --no-config option](https://prettier.io/docs/en/cli.html#--no-config) or through the API by [calling prettier.format() without passing through the options generated by calling resolveConfig](https://prettier.io/docs/en/api.html#prettierresolveconfigfilepath--options).
 
       ```json
       {