Marked all plugins as internal

Author: GrahamCampbell

lib/Gitlab/HttpClient/Plugin/ApiVersion.php

@@ -10,6 +10,8 @@
 /**
  * Prefix requests path with /api/v4/ if required.
  *
+ * @internal
+ *
  * @final
  *
  * @author Fabien Bourigault <[email protected]>

lib/Gitlab/HttpClient/Plugin/Authentication.php

@@ -10,6 +10,8 @@
 /**
  * Add authentication to the request.
  *
+ * @internal
+ *
  * @final
  *
  * @author Tobias Nyholm <[email protected]>

lib/Gitlab/HttpClient/Plugin/GitlabExceptionThrower.php

@@ -15,6 +15,8 @@
 /**
  * A plugin to remember the last response.
  *
+ * @internal
+ *
  * @final
  *
  * @author Tobias Nyholm <[email protected]>

lib/Gitlab/HttpClient/Plugin/History.php

@@ -9,6 +9,8 @@
 /**
  * A plugin to remember the last response.
  *
+ * @internal
+ *
  * @final
  *
  * @author Tobias Nyholm <[email protected]>

lib/Gitlab/HttpClient/Plugin/HistoryTrait.php

@@ -8,6 +8,9 @@
 use Psr\Http\Message\RequestInterface;
 
 if (interface_exists(HttpMethodsClientInterface::class)) {
+    /**
+     * @internal
+     */
     trait HistoryTrait
     {
         /**
@@ -23,6 +26,9 @@ public function addFailure(RequestInterface $request, ClientExceptionInterface $
         }
     }
 } else {
+    /**
+     * @internal
+     */
     trait HistoryTrait
     {
         /**