Streamline dependency constraints and add support for Laravel 5.7+

Author: pmatseykanets

composer.json

@@ -13,16 +13,15 @@
         {
             "name": "Peter Matseykanets",
             "email": "[email protected]",
-            "homepage": "https://github.com/pmatseykanets",
-            "role": "Developer"
+            "homepage": "https://github.com/pmatseykanets"
         }
     ],
     "require": {
         "php": ">=5.6.4",
         "guzzlehttp/guzzle": "^6.2",
-        "illuminate/queue": "5.1.*|5.2.*|5.3.*|5.4.*|5.5.*|5.6.*",
-        "illuminate/notifications": "5.3.*|5.4.*|5.5.*|5.6.*",
-        "illuminate/support": "5.1.*|5.2.*|5.3.*|5.4.*|5.5.*|5.6.*"
+        "illuminate/queue": "~5.1",
+        "illuminate/notifications": "~5.3",
+        "illuminate/support": "~5.1"
     },
     "require-dev": {
         "mockery/mockery": "~1.0",