Remove manifold header as Releases api is official now

Author: cursedcoder

lib/Github/Api/Repository/Assets.php

@@ -11,16 +11,6 @@
  */
 class Assets extends AbstractApi
 {
-    /**
-     * @deprecated Will be removed as soon as gh releases api gets stable
-     */
-    public function configure()
-    {
-        $this->client->setHeaders(array(
-            'Accept: application/vnd.github.manifold-preview'
-        ));
-    }
-
     /**
      * Get all release's assets in selected repository
      * GET /repos/:owner/:repo/releases/:id/assets

lib/Github/Api/Repository/Releases.php

@@ -12,16 +12,6 @@
  */
 class Releases extends AbstractApi
 {
-    /**
-     * @deprecated Will be removed as soon as gh releases api gets stable
-     */
-    public function configure()
-    {
-        $this->client->setHeaders(array(
-            'Accept: application/vnd.github.manifold-preview'
-        ));
-    }
-
     /**
      * List releases in selected repository
      *