updated README (jantimon#539)

Author: numical

README.md

@@ -29,7 +29,9 @@ There are already some really powerful plugins which can be integrated with zero
  * [favicons-webpack-plugin](https://github.com/jantimon/favicons-webpack-plugin) which generates favicons and icons for iOS, Android and desktop browsers
  * [html-webpack-harddisk-plugin](https://github.com/jantimon/html-webpack-harddisk-plugin)
  * [html-webpack-inline-source-plugin](https://github.com/DustinJackson/html-webpack-inline-source-plugin) to inline your assets in the resulting HTML file
- * [html-webpack-exclude-assets-plugin](https://github.com/jamesjieye/html-webpack-exclude-assets-plugin) for excluding assets using regular expressions
+ * [html-webpack-exclude-assets-plugin](https://github.com/jamesjieye/html-webpack-exclude-assets-plugin) for excluding assets using regular expressions 
+ * [script-ext-html-webpack-plugin](https://github.com/numical/script-ext-html-webpack-plugin) to add `async`, `defer` or `module` attributes to your`<script>` elements, or even in-line them
+ * [style-ext-html-webpack-plugin](https://github.com/numical/style-ext-html-webpack-plugin) to convert your `<link>`s to external stylesheets into `<style>` elements containing internal CSS
 
 Basic Usage
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