Merge pull request #339 from 8p/fix_deprecations

Fix deprecations (return void)

Author: gregurco

src/DataCollector/DataCollectorSymfonyCompatibilityTrait.php

@@ -16,7 +16,7 @@ abstract protected function doCollect(Request $request, Response $response, \Thr
      *
      * @return void
      */
-    public function collect(Request $request, Response $response, \Throwable $exception = null)
+    public function collect(Request $request, Response $response, \Throwable $exception = null): void
     {
         $this->doCollect($request, $response, $exception);
     }

src/EightPointsGuzzleBundle.php

@@ -60,7 +60,7 @@ public function getContainerExtension() : ExtensionInterface
      *
      * @return void
      */
-    public function boot()
+    public function boot(): void
     {
         foreach ($this->plugins as $plugin) {
             $plugin->boot();