docs: fix runtime value (#952)

Author: ersachin3112

README.md

@@ -325,7 +325,7 @@ Allows to enable/disable the runtime generation.
 CSS will be still extracted and can be used for a custom loading methods.
 For example, you can use [assets-webpack-plugin](https://github.com/ztoben/assets-webpack-plugin) to retrieve them then use your own runtime code to download assets when needed.
 
-`true` to skip.
+`false` to skip.
 
 **webpack.config.js**