Upgrade to Laravel 8 (#18)

Author: patriziotomato

Diff for: changelog.md

@@ -6,6 +6,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+## v4.0
+### Added
+- Add support for Laravel 8
+
 ## v3.1
 ### Added
 - Add support for empty values in field definition

Diff for: composer.json

@@ -13,13 +13,13 @@
   "license": "MIT",
   "type": "project",
   "require": {
-    "php": ">=7.1",
-    "laravel/framework": "^6.0|^7.1",
+    "php": ">=7.3",
+    "laravel/framework": "^6.0|^7.1|^8.0",
     "league/csv": "^9.0"
   },
   "require-dev": {
-    "phpunit/phpunit": "^8.5",
-    "orchestra/testbench": "^5.1"
+    "phpunit/phpunit": "^9.0",
+    "orchestra/testbench": "^6.0"
   },
   "autoload": {
     "psr-4": {