Fix composer.json in encryption (#217)

Author: prisis

composer.json

@@ -38,7 +38,7 @@
     "require-dev": {
         "phpunit/phpunit": "^5.7.21",
         "cache/integration-tests": "^0.16",
-        "cache/array-adapter": "^1.0"
+        "cache/filesystem-adapter": "^1.0"
     },
     "autoload": {
         "psr-4": {