Upgrade for Laravel 5.7

Not tested

Author: chilio

composer.json

@@ -8,13 +8,13 @@
   ],
   "license"           : "GPL-3.0+",
   "require"           : {
-    "illuminate/support"                  : "5.5.*",
+    "illuminate/support"                  : "5.7.*",
     "friendsofphp/php-cs-fixer"           : "^2.6",
     "potsky/microsoft-translator-php-sdk" : "*"
   },
   "require-dev"       : {
     "orchestra/testbench"    : "3.5.*",
-    "phpunit/phpunit"        : "^6.0",
+    "phpunit/phpunit"        : "^7.0",
     "satooshi/php-coveralls" : "dev-master"
   },
   "autoload"          : {