Update dependencies and remove unused phpunit config option

composer.json

@@ -15,18 +15,18 @@
         }
     ],
     "require": {
-        "php": ">=5.5.0",
-        "fzaninotto/faker": "~1.0",
-        "laravel/framework": "~5.4",
+        "php": ">=7.1.3",
+        "fzaninotto/faker": "~1.8",
+        "laravel/framework": "5.6.* || 5.7.*",
         "mpociot/documentarian": "^0.2.0",
         "mpociot/reflection-docblock": "^1.0",
-        "ramsey/uuid": "^3.0"
+        "ramsey/uuid": "^3.8"
     },
     "require-dev": {
-        "orchestra/testbench": "~3.0",
-        "phpunit/phpunit": "~4.0 || ~5.0",
-        "dingo/api": "1.0.*@dev",
-        "mockery/mockery": "^0.9.5"
+        "orchestra/testbench": "3.6.* || 3.7.*",
+        "phpunit/phpunit": "^7.4.0",
+        "dingo/api": "2.0.0-alpha1",
+        "mockery/mockery": "^1.2.0"
     },
     "autoload": {
         "psr-0": {

phpunit.xml

@@ -7,8 +7,7 @@
          convertNoticesToExceptions="true"
          convertWarningsToExceptions="true"
          processIsolation="false"
-         stopOnFailure="true"
-         syntaxCheck="false">
+         stopOnFailure="true">
     <testsuites>
         <testsuite name="Versionable Suite">
             <directory>tests/</directory>