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diff --git a/vendor/php-http/promise/src/Promise.php b/vendor/php-http/promise/src/Promise.php
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+++ b/vendor/php-http/promise/src/Promise.php
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+<?php
+
+namespace Http\Promise;
+
+/**
+ * Promise represents a value that may not be available yet, but will be resolved at some point in future.
+ * It acts like a proxy to the actual value.
+ *
+ * This interface is an extension of the promises/a+ specification.
+ *
+ * @see https://promisesaplus.com/
+ *
+ * @author Joel Wurtz <[email protected]>
+ * @author Márk Sági-Kazár <[email protected]>
+ */
+interface Promise
+{
+    /**
+     * Promise has not been fulfilled or rejected.
+     */
+    const PENDING = 'pending';
+
+    /**
+     * Promise has been fulfilled.
+     */
+    const FULFILLED = 'fulfilled';
+
+    /**
+     * Promise has been rejected.
+     */
+    const REJECTED = 'rejected';
+
+    /**
+     * Adds behavior for when the promise is resolved or rejected (response will be available, or error happens).
+     *
+     * If you do not care about one of the cases, you can set the corresponding callable to null
+     * The callback will be called when the value arrived and never more than once.
+     *
+     * @param callable|null $onFulfilled called when a response will be available
+     * @param callable|null $onRejected  called when an exception occurs
+     *
+     * @return Promise a new resolved promise with value of the executed callback (onFulfilled / onRejected)
+     */
+    public function then(callable $onFulfilled = null, callable $onRejected = null);
+
+    /**
+     * Returns the state of the promise, one of PENDING, FULFILLED or REJECTED.
+     *
+     * @return string
+     */
+    public function getState();
+
+    /**
+     * Wait for the promise to be fulfilled or rejected.
+     *
+     * When this method returns, the request has been resolved and if callables have been
+     * specified, the appropriate one has terminated.
+     *
+     * When $unwrap is true (the default), the response is returned, or the exception thrown
+     * on failure. Otherwise, nothing is returned or thrown.
+     *
+     * @param bool $unwrap Whether to return resolved value / throw reason or not
+     *
+     * @return mixed Resolved value, null if $unwrap is set to false
+     *
+     * @throws \Exception the rejection reason if $unwrap is set to true and the request failed
+     */
+    public function wait($unwrap = true);
+}