Version updates

Author: rowan-m

composer.json

@@ -13,8 +13,8 @@
         "php": ">=5.5"
     },
     "require-dev": {
-        "phpunit/phpunit": "^4.8.36|^5.7.27|^6.59|^7",
-        "friendsofphp/php-cs-fixer": "^2.2.20|^2.12",
+        "phpunit/phpunit": "^4.8.36|^5.7.27|^6.59|^7.5.11",
+        "friendsofphp/php-cs-fixer": "^2.2.20|^2.15",
         "php-coveralls/php-coveralls": "^2.1"
     },
     "autoload": {