Support Laravel 5.5-5.8

Author: jimmypuckett

composer.json

@@ -16,18 +16,16 @@
         }
     ],
     "require": {
-        "php": ">=5.5.0",
-        "illuminate/support": "~5.1.10|5.2.*|5.3.*|5.4.*|5.5.*|5.6.*",
-        "swiftmailer/swiftmailer": "~5.1|~6.0",
-        "phpunit/phpunit": "~4.0|~5.0|~6.0|~7.0"
+        "php": ">=7.2",
+        "illuminate/support": "5.5.*|5.6.*|5.7.*|5.8.*",
+        "swiftmailer/swiftmailer": "~6.0",
+        "phpunit/phpunit": "~7.0.1|^7.5"
     },
     "require-dev": {
-        "mockery/mockery": "~0.9",
-        "phpunit/phpunit": "~4.0",
+        "mockery/mockery": "^1",
         "psy/psysh": "^0.5.1",
-        "satooshi/php-coveralls": "~1",
         "symfony/thanks": "^1.0",
-        "symfony/var-dumper": "~3.0"
+        "symfony/var-dumper": "~3.0|^4.2"
     },
     "autoload": {
         "psr-4": {