Merge branch 'v5' of github.com:lazychaser/laravel-nestedset into v5

Author: lazychaser

composer.json

@@ -13,9 +13,9 @@
 
     "require": {
         "php": ">=7.1.3",
-        "illuminate/support": "~5.7.0|~5.8.0|~6.0|~7.0",
-        "illuminate/database": "~5.7.0|~5.8.0|~6.0|~7.0",
-        "illuminate/events": "~5.7.0|~5.8.0|~6.0|~7.0"
+        "illuminate/support": "~5.7.0|~5.8.0|^6.0|^7.0",
+        "illuminate/database": "~5.7.0|~5.8.0|^6.0|^7.0",
+        "illuminate/events": "~5.7.0|~5.8.0|^6.0|^7.0"
     },
 
     "autoload": {