Remove unused dependencies

Author: Jordan Hall

composer.json

@@ -15,9 +15,7 @@
     },
     "require-dev": {
         "phpunit/phpunit": "^7.0||^8.0",
-        "fzaninotto/faker": "^1.6",
-        "php-coveralls/php-coveralls": "^2.0",
-        "cache/array-adapter": "^1.0"
+        "php-coveralls/php-coveralls": "^2.0"
     },
     "autoload": {
         "psr-4": {