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

vendor/zendframework/zend-feed/CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file, in reverse chronological order by release.
+
+## 2.5.2 - TBD
+
+### Added
+
+- Nothing.
+
+### Deprecated
+
+- Nothing.
+
+### Removed
+
+- Nothing.
+
+### Fixed
+
+- [#5](https://github.com/zendframework/zend-feed/pull/5) fixes the enclosure
+  length check to allow zero and integer strings.
+- [#2](https://github.com/zendframework/zend-feed/pull/2) ensures that the
+  routine for "absolutising" a link in `Reader\FeedSet` always generates a URI
+  with a scheme.