laravel v7 support (#70)

Author: introwit

composer.json

@@ -11,7 +11,7 @@
     ],
     "require": {
         "php": ">=5.4.0",
-        "illuminate/support": "~5.0|^6.0",
+        "illuminate/support": "~5.0|^6.0|^7.0",
         "tijsverkoyen/css-to-inline-styles": "~2.0"
     },
     "require-dev" : {