README update

Author: Filip Pasternak

readme.md

@@ -93,7 +93,7 @@ $ extract-messages --help
   --flat             json [default: true] | yaml [default: false]
   --default-locale   default locale [default: en]
   --delimiter        json | yaml [default: .]
-  --module-name         module source name from where components are imported
+  --module-name      module source name from where components are imported [default: react-intl]
 
   Example
   $ extract-messages --locales=ja,en --output app/translations 'app/**/*.js'
@@ -164,6 +164,13 @@ If format is `yaml`, set to `false`.
 Be careful if `false`.
 See [this issue](https://github.com/akameco/extract-react-intl-messages/issues/3).
 
+##### moduleName
+
+Type: `string`<br>
+Default: `react-intl`
+
+Set from where _defineMessages_, `<FormatterMessage />` and `<FormattedHTML />` are imported.
+
 ## Contributors
 
 Thanks goes to these wonderful people ([emoji key](https://github.com/kentcdodds/all-contributors#emoji-key)):