Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

vendor/composer/semver/README.md

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+composer/semver
+===============
+
+Semver library that offers utilities, version constraint parsing and validation.
+
+Originally written as part of [composer/composer](https://github.com/composer/composer),
+now extracted and made available as a stand-alone library.
+
+[![Build Status](https://travis-ci.org/composer/semver.svg?branch=master)](https://travis-ci.org/composer/semver)
+
+
+Installation
+------------
+
+Install the latest version with:
+
+```bash
+$ composer require composer/semver
+```
+
+
+Requirements
+------------
+
+* PHP 5.3.2 is required but using the latest version of PHP is highly recommended.
+
+
+Version Comparison
+------------------
+
+For details on how versions are compared, refer to the [Versions](https://getcomposer.org/doc/articles/versions.md)
+article in the documentation section of the [getcomposer.org](https://getcomposer.org) website.
+
+
+Basic usage
+-----------
+
+### Comparator
+
+The `Composer\Semver\Comparator` class provides the following methods for comparing versions:
+
+* greaterThan($v1, $v2)
+* greaterThanOrEqualTo($v1, $v2)
+* lessThan($v1, $v2)
+* lessThanOrEqualTo($v1, $v2)
+* equalTo($v1, $v2)
+* notEqualTo($v1, $v2)
+
+Each function takes two version strings as arguments. For example:
+
+```php
+use Composer\Semver\Comparator;
+
+Comparator::greaterThan('1.25.0', '1.24.0'); // 1.25.0 > 1.24.0
+```
+
+### Semver
+
+The `Composer\Semver\Semver` class providers the following methods:
+
+* satisfies($version, $constraints)
+* satisfiedBy($constraint, array $versions)
+* sort($versions)
+* rsort($versions)
+
+
+License
+-------
+
+composer/semver is licensed under the MIT License, see the LICENSE file for details.