v1.4.2

Added

• Added cache() helper backed by Psr\SimpleCache\CacheInterface.
• Added event() helper backed by Psr\EventDispatcher\EventDispatcherInterface.
• Added deprecate() helper for standard API deprecation notices.
• Added old() and errors() helpers for flashed validation state.

Changed

• Raised codemonster-ru/http to ^2.1 for the PSR-7 HTTP line.