Update docblock

ADmad · ADmad · commit c87002deca3b · 2020-09-28T14:06:34.000+05:30
diff --git a/src/Installer/PluginInstaller.php b/src/Installer/PluginInstaller.php
@@ -7,7 +7,9 @@
 use Composer\Script\Event;
 
 /**
- * @deprecated No longer used since v2.0
+ * @deprecated No longer needed since v1.3.
+ *   It has been kept only to show warning to users to remove
+ *   PluginInstaller::postAutoloadDump from the "post-autoload-dump" hook.
  */
 class PluginInstaller extends LibraryInstaller
 {
