Fixed ordering of Announcements

Author: abhishekmsingh

DigiKaksha/app/Course.php

@@ -18,6 +18,6 @@ public function groups()
     }
     public function announcements()
     {
-        return $this->hasMany('App\Announcement')->orderBy('created_at');
+        return $this->hasMany('App\Announcement')->orderBy('created_at', 'desc');
     }
 }