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diff --git a/vendor/drush/drush/lib/Drush/Cache/CacheInterface.php b/vendor/drush/drush/lib/Drush/Cache/CacheInterface.php
new file mode 100644
index 000000000..f3ab29ef5
--- /dev/null
+++ b/vendor/drush/drush/lib/Drush/Cache/CacheInterface.php
@@ -0,0 +1,112 @@
+<?php
+
+/**
+ * @file
+ * Definition of Drush\Cache\CacheInterface.
+ */
+
+namespace Drush\Cache;
+
+/**
+ * Interface for cache implementations.
+ *
+ * All cache implementations have to implement this interface.
+ * JSONCache provides the default implementation, which can be
+ * consulted as an example.
+ *
+ * To make Drush use your implementation for a certain cache bin, you have to
+ * set a variable with the name of the cache bin as its key and the name of
+ * your class as its value. For example, if your implementation of
+ * CacheInterface was called MyCustomCache, the following line in
+ * drushrc.php would make Drush use it for the 'example' bin:
+ * @code
+ *  $options['cache-class-example'] = 'MyCustomCache;
+ * @endcode
+ *
+ * Additionally, you can register your cache implementation to be used by
+ * default for all cache bins by setting the option 'cache-default-class' to
+ * the name of your implementation of the CacheInterface, e.g.
+ * @code
+ *  $options['cache-default-class'] = 'MyCustomCache;
+ * @endcode
+ *
+ * @see _drush_cache_get_object()
+ * @see \Drupal\Core\Cache\CacheBackendInterface
+ */
+interface CacheInterface {
+
+/**
+ * Constructor.
+ *
+ * @param $bin
+ *   The cache bin for which the object is created.
+*/
+function __construct($bin);
+
+/**
+ * Return data from the persistent cache.
+ *
+ * @param string $cid
+ *   The cache ID of the data to retrieve.
+ *
+ * @return
+ *   The cache or FALSE on failure.
+ */
+function get($cid);
+
+/**
+ * Return data from the persistent cache when given an array of cache IDs.
+ *
+ * @param array $cids
+ *   An array of cache IDs for the data to retrieve. This is passed by
+ *   reference, and will have the IDs successfully returned from cache
+ *   removed.
+ *
+ * @return
+ *   An array of the items successfully returned from cache indexed by cid.
+ */
+function getMultiple(&$cids);
+
+/**
+ * Store data in the persistent cache.
+ *
+ * @param string $cid
+ *   The cache ID of the data to store.
+ * @param array $data
+ *   The data to store in the cache.
+ * @param $expire
+ *   One of the following values:
+ *   - DRUSH_CACHE_PERMANENT: Indicates that the item should never be removed unless
+ *     explicitly told to using _drush_cache_clear_all() with a cache ID.
+ *   - DRUSH_CACHE_TEMPORARY: Indicates that the item should be removed at the next
+ *     general cache wipe.
+ *   - A Unix timestamp: Indicates that the item should be kept at least until
+ *     the given time, after which it behaves like CACHE_TEMPORARY.
+ */
+function set($cid, $data, $expire = DRUSH_CACHE_PERMANENT);
+
+/**
+ * Expire data from the cache. If called without arguments, expirable
+ * entries will be cleared from all known cache bins.
+ *
+ * @param string $cid
+ *   If set, the cache ID to delete. Otherwise, all cache entries that can
+ *   expire are deleted.
+ * @param bool $wildcard
+ *   If set to TRUE, the $cid is treated as a substring
+ *   to match rather than a complete ID. The match is a right hand
+ *   match. If '*' is given as $cid, the bin $bin will be emptied.
+ */
+function clear($cid = NULL, $wildcard = FALSE);
+
+/**
+ * Check if a cache bin is empty.
+ *
+ * A cache bin is considered empty if it does not contain any valid data for
+ * any cache ID.
+ *
+ * @return
+ *   TRUE if the cache bin specified is empty.
+ */
+function isEmpty();
+}