Allow psr/cache ^1.0 || ^2.0 (#255)

All packages now allow v1 and v2.

Author: ruudk

composer.json

@@ -28,7 +28,7 @@
     "homepage": "http://www.php-cache.com/en/latest/",
     "require": {
         "php": "^5.6 || ^7.0 || ^8.0",
-        "psr/cache": "^1.0",
+        "psr/cache": "^1.0 || ^2.0",
         "symfony/polyfill-php70": "^1.6"
     },
     "require-dev": {