Guzzle Cache Middleware Versions Save

• always return stale on rejection (#169)

• (feat): Upgrade to Flysystem v2 (#183)

• fix: restore cache entry unserialization compatibility #181

• use __serialize instead of __sleep on CacheEntry #163

The inspect_all function has been changed to Utils::inspectAll #178

• Update composer allow-plugins directive #168
• Set empty string as default value #161

• #159 Rewind body stream

• Drop support of PHP <7.2.0 #154
• Fix igbinar_serialize error #156
• Invalide cache when HTTP unsafe methods are used #157

• Allow guzzlehttp/psr7 to use version ^2.0.0 #151

• https://github.com/Kevinrob/guzzle-cache-middleware/commit/0e4dfb47e02f2b6f9b36c5ec510da98ca96306b9 set constraint for guzzlehttp/psr7