Add support for player upcoming chests (#14)

* Updated README for new function and updated sample code for Player functions

* Added new function to get the upcoming chests for a Player

* Added punctuation to descriptions

* Removed superfluous newline

README.md

@@ -94,7 +94,7 @@ List [with all current war parameters](https://developer.clashroyale.com/api-doc
 
 ``` php
 <?php
-use Edbizarro\ClashRoyale\Clan;
+use Edbizarro\ClashRoyale\Player;
 
 $player = new Player('player_tag');
 $player->get();
@@ -105,13 +105,24 @@ $player->get();
 
 ``` php
 <?php
-use Edbizarro\ClashRoyale\Clan;
+use Edbizarro\ClashRoyale\Player;
 
 $player = new Player('player_tag');
 $player->battles();
 
 ```
 
+### Upcoming Chests
+
+``` php
+<?php
+use Edbizarro\ClashRoyale\Player;
+
+$player = new Player('player_tag');
+$player->upcomingChests();
+
+```
+
 ## Changelog
 
 Please see [CHANGELOG](CHANGELOG.md) for more information on what has changed recently.

src/Player.php

@@ -10,6 +10,8 @@ class Player extends Resource
     protected $resourceName = 'players';
 
     /**
+     * Returns a list of battles that the Player has recently participated in.
+     *
      * @param array $options
      *
      * @return Collection
@@ -26,4 +28,24 @@ public function battles(array $options = []): Collection
             )
         );
     }
+
+    /**
+     * Returns the chests that are upcoming for the Player.
+     *
+     * @param array $options
+     *
+     * @return Collection
+     * @throws Exception
+     *
+     * @see https://developer.clashroyale.com/api-docs/index.html#!/players/getPlayerUpcomingChests
+     */
+    public function upcomingChests(array $options = []): Collection
+    {
+        return $this->response(
+            $this->api->makeRequest(
+                $this->getResourceFinalUrl().'/upcomingchests',
+                $options
+            )
+        );
+    }
 }