get rid of psr/cache dependency

Author: dannyvankooten

composer.json

@@ -14,14 +14,10 @@
     "ext-curl": "*",
     "ext-json": "*",
     "ext-soap": "*",
-    "psr/simple-cache": "^1.0"
   },
   "require-dev": {
     "phpunit/phpunit": "^7.5"
   },
-  "provide": {
-      "psr/simple-cache-implementation": "1.0"
-  },
   "autoload": {
     "psr-4": {
       "Ibericode\\Vat\\": "src/"