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diff --git a/vendor/zendframework/zend-feed/src/Writer/Extension/GooglePlayPodcast/Feed.php b/vendor/zendframework/zend-feed/src/Writer/Extension/GooglePlayPodcast/Feed.php
new file mode 100644
index 000000000..af9ef6908
--- /dev/null
+++ b/vendor/zendframework/zend-feed/src/Writer/Extension/GooglePlayPodcast/Feed.php
@@ -0,0 +1,245 @@
+<?php
+/**
+ * @see       https://github.com/zendframework/zend-zend-feed for the canonical source repository
+ * @copyright Copyright (c) 2018 Zend Technologies USA Inc. (https://www.zend.com)
+ * @license   https://github.com/zendframework/zend-zend-feed/blob/master/LICENSE.md New BSD License
+ */
+
+namespace Zend\Feed\Writer\Extension\GooglePlayPodcast;
+
+use Zend\Feed\Uri;
+use Zend\Feed\Writer;
+use Zend\Stdlib\StringUtils;
+use Zend\Stdlib\StringWrapper\StringWrapperInterface;
+
+class Feed
+{
+    /**
+     * Array of Feed data for rendering by Extension's renderers
+     *
+     * @var array
+     */
+    protected $data = [];
+
+    /**
+     * Encoding of all text values
+     *
+     * @var string
+     */
+    protected $encoding = 'UTF-8';
+
+    /**
+     * The used string wrapper supporting encoding
+     *
+     * @var StringWrapperInterface
+     */
+    protected $stringWrapper;
+
+    /**
+     * Constructor
+     */
+    public function __construct()
+    {
+        $this->stringWrapper = StringUtils::getWrapper($this->encoding);
+    }
+
+    /**
+     * Set feed encoding
+     *
+     * @param  string $enc
+     * @return Feed
+     */
+    public function setEncoding($enc)
+    {
+        $this->stringWrapper = StringUtils::getWrapper($enc);
+        $this->encoding      = $enc;
+        return $this;
+    }
+
+    /**
+     * Get feed encoding
+     *
+     * @return string
+     */
+    public function getEncoding()
+    {
+        return $this->encoding;
+    }
+
+    /**
+     * Set a block value of "yes" or "no". You may also set an empty string.
+     *
+     * @param  string
+     * @return Feed
+     * @throws Writer\Exception\InvalidArgumentException
+     */
+    public function setPlayPodcastBlock($value)
+    {
+        if (! ctype_alpha($value) && strlen($value) > 0) {
+            throw new Writer\Exception\InvalidArgumentException(
+                'invalid parameter: "block" may only contain alphabetic characters'
+            );
+        }
+        if ($this->stringWrapper->strlen($value) > 255) {
+            throw new Writer\Exception\InvalidArgumentException(
+                'invalid parameter: "block" may only contain a maximum of 255 characters'
+            );
+        }
+        $this->data['block'] = $value;
+        return $this;
+    }
+
+    /**
+     * Add feed authors
+     *
+     * @param  array $values
+     * @return Feed
+     */
+    public function addPlayPodcastAuthors(array $values)
+    {
+        foreach ($values as $value) {
+            $this->addPlayPodcastAuthor($value);
+        }
+        return $this;
+    }
+
+    /**
+     * Add feed author
+     *
+     * @param  string $value
+     * @return Feed
+     * @throws Writer\Exception\InvalidArgumentException
+     */
+    public function addPlayPodcastAuthor($value)
+    {
+        if ($this->stringWrapper->strlen($value) > 255) {
+            throw new Writer\Exception\InvalidArgumentException(
+                'invalid parameter: any "author" may only contain a maximum of 255 characters each'
+            );
+        }
+        if (! isset($this->data['authors'])) {
+            $this->data['authors'] = [];
+        }
+        $this->data['authors'][] = $value;
+        return $this;
+    }
+
+    /**
+     * Set feed categories
+     *
+     * @param  array $values
+     * @return Feed
+     * @throws Writer\Exception\InvalidArgumentException
+     */
+    public function setPlayPodcastCategories(array $values)
+    {
+        if (! isset($this->data['categories'])) {
+            $this->data['categories'] = [];
+        }
+        foreach ($values as $key => $value) {
+            if (! is_array($value)) {
+                if ($this->stringWrapper->strlen($value) > 255) {
+                    throw new Writer\Exception\InvalidArgumentException(
+                        'invalid parameter: any "category" may only contain a maximum of 255 characters each'
+                    );
+                }
+                $this->data['categories'][] = $value;
+            } else {
+                if ($this->stringWrapper->strlen($key) > 255) {
+                    throw new Writer\Exception\InvalidArgumentException(
+                        'invalid parameter: any "category" may only contain a maximum of 255 characters each'
+                    );
+                }
+                $this->data['categories'][$key] = [];
+                foreach ($value as $val) {
+                    if ($this->stringWrapper->strlen($val) > 255) {
+                        throw new Writer\Exception\InvalidArgumentException(
+                            'invalid parameter: any "category" may only contain a maximum of 255 characters each'
+                        );
+                    }
+                    $this->data['categories'][$key][] = $val;
+                }
+            }
+        }
+        return $this;
+    }
+
+    /**
+     * Set feed image (icon)
+     *
+     * @param  string $value
+     * @return Feed
+     * @throws Writer\Exception\InvalidArgumentException
+     */
+    public function setPlayPodcastImage($value)
+    {
+        if (! is_string($value) || ! Uri::factory($value)->isValid()) {
+            throw new Writer\Exception\InvalidArgumentException(
+                'invalid parameter: "image" may only be a valid URI/IRI'
+            );
+        }
+        $this->data['image'] = $value;
+        return $this;
+    }
+
+    /**
+     * Set "explicit" flag
+     *
+     * @param  bool $value
+     * @return Feed
+     * @throws Writer\Exception\InvalidArgumentException
+     */
+    public function setPlayPodcastExplicit($value)
+    {
+        if (! in_array($value, ['yes', 'no', 'clean'], true)) {
+            throw new Writer\Exception\InvalidArgumentException(
+                'invalid parameter: "explicit" may only be one of "yes", "no" or "clean"'
+            );
+        }
+        $this->data['explicit'] = $value;
+        return $this;
+    }
+
+    /**
+     * Set podcast description
+     *
+     * @param  string $value
+     * @return Feed
+     * @throws Writer\Exception\InvalidArgumentException
+     */
+    public function setPlayPodcastDescription($value)
+    {
+        if ($this->stringWrapper->strlen($value) > 4000) {
+            throw new Writer\Exception\InvalidArgumentException(
+                'invalid parameter: "description" may only contain a maximum of 4000 characters'
+            );
+        }
+        $this->data['description'] = $value;
+        return $this;
+    }
+
+    /**
+     * Overloading: proxy to internal setters
+     *
+     * @param  string $method
+     * @param  array $params
+     * @return mixed
+     * @throws Writer\Exception\BadMethodCallException
+     */
+    public function __call($method, array $params)
+    {
+        $point = lcfirst(substr($method, 14));
+        if (! method_exists($this, 'setPlayPodcast' . ucfirst($point))
+            && ! method_exists($this, 'addPlayPodcast' . ucfirst($point))
+        ) {
+            throw new Writer\Exception\BadMethodCallException(
+                'invalid method: ' . $method
+            );
+        }
+
+        if (! array_key_exists($point, $this->data) || empty($this->data[$point])) {
+            return;
+        }
+        return $this->data[$point];
+    }
+}