Update dependencies

Author: AlexanderPoellmann

composer.json

@@ -21,12 +21,14 @@
     ],
     "require": {
         "php"                   : ">=5.6.4|^7.0",
-        "doctrine/dbal"         : "2.5.x",
         "illuminate/support"    : ">=5.1",
         "illuminate/database"   : ">=5.1"
     },
     "require-dev": {
-        "mockery/mockery" : "0.9.*"
+        "laravel/framework" : "5.4.*",
+        "mockery/mockery" : "0.9.*",
+        "phpunit/phpunit" : "^6.0",
+        "doctrine/dbal"   : "2.5.x"
     },
     "autoload": {
         "psr-4": {