Require psr/simple-cache

Author: Arthur

composer.json

@@ -32,7 +32,8 @@
         "spatie/schema-org": "^2.1",
         "symfony/templating": "^4.2",
         "ramsey/uuid": "^3.8",
-        "ext-json": "*"
+        "ext-json": "*",
+        "psr/simple-cache": "^1.0"
     },
     "require-dev": {
         "symfony/phpunit-bridge": "4.2.*",