minor #204 Fix bootstrap.js path in README (l-vo)

This PR was merged into the 2.x branch.

Discussion
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Fix bootstrap.js path in README

| Q             | A
| ------------- | ---
| Bug fix?      | yes (only documentation)
| New feature?  | no
| Tickets       |
| License       | MIT

See https://github.com/symfony/recipes/tree/master/symfony/webpack-encore-bundle/1.9/assets

Commits
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1b64392 Fix bootstrap.js path in README

Author: tgalopin

src/LiveComponent/README.md

@@ -73,10 +73,10 @@ composer require symfony/ux-live-component
 
 This comes with an embedded JavaScript Stimulus controller. Unlike
 other Symfony UX packages, this needs to be enabled manually
-in your `config/bootstrap.js` file:
+in your `assets/bootstrap.js` file:
 
 ```js
-// config/bootstrap.js
+// assets/bootstrap.js
 import LiveController from '@symfony/ux-live-component';
 import '@symfony/ux-live-component/styles/live.css';
 // ...