chore(readme): fix icss default

Author: UziTech

README.md

@@ -114,7 +114,7 @@ module.exports = {
 |           **[`url`](#url)**           |    `{Boolean\|Function}`    |       `true`       | Enables/Disables `url`/`image-set` functions handling                  |
 |        **[`import`](#import)**        |    `{Boolean\|Function}`    |       `true`       | Enables/Disables `@import` at-rules handling                           |
 |       **[`modules`](#modules)**       | `{Boolean\|String\|Object}` |   `{auto: true}`   | Enables/Disables CSS Modules and their configuration                   |
-|          **[`icss`](#icss)**          |         `{Boolean}`         |    `!!modules`     | Enables/Disables Interoperable CSS                                     |
+|          **[`icss`](#icss)**          |         `{Boolean}`         | `true` if `modules` are enabled, `false` otherwise | Enables/Disables Interoperable CSS     |
 |     **[`sourceMap`](#sourcemap)**     |         `{Boolean}`         | `compiler.devtool` | Enables/Disables generation of source maps                             |
 | **[`importLoaders`](#importloaders)** |         `{Number}`          |        `0`         | Enables/Disables or setups number of loaders applied before CSS loader |
 |      **[`esModule`](#esmodule)**      |         `{Boolean}`         |       `true`       | Use ES modules syntax                                                  |