Update vendored libs

vendor/psr/cache/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.
+
+## 1.0.1 - 2016-08-06
+
+### Fixed
+
+- Make spacing consistent in phpdoc annotations php-fig/cache#9 - chalasr
+- Fix grammar in phpdoc annotations php-fig/cache#10 - chalasr
+- Be more specific in docblocks that `getItems()` and `deleteItems()` take an array of strings (`string[]`) compared to just `array` php-fig/cache#8 - GrahamCampbell
+- For `expiresAt()` and `expiresAfter()` in CacheItemInterface fix docblock to specify null as a valid parameters as well as an implementation of DateTimeInterface php-fig/cache#7 - GrahamCampbell
+
+## 1.0.0 - 2015-12-11
+
+Initial stable release; reflects accepted PSR-6 specification