add comments into upgrade-4.3.md

Emmanuel BORGES · Emmanuel BORGES · commit b9212004c98f · 2019-03-04T13:40:19.000+01:00
diff --git a/UPGRADE-4.3.md b/UPGRADE-4.3.md
@@ -37,6 +37,7 @@ FrameworkBundle
  * Not passing the project directory to the constructor of the `AssetsInstallCommand` is deprecated. This argument will
    be mandatory in 5.0.
  * Deprecated the "Psr\SimpleCache\CacheInterface" / "cache.app.simple" service, use "Symfony\Contracts\Cache\CacheInterface" / "cache.app" instead.
+ * The `generate()` method of the `UrlGenerator` class return empty string instead of null
 
 HttpFoundation
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