Update laravel requirement on composer json (#11)

* Update composer.json

update composer json to work with all 6.x version

* Update README.md

Author: matthew-inamdar

README.md

@@ -51,12 +51,12 @@ version of Laravel you have installed:
 | Laravel | This package |
 | ------- | ------------ |
 | `v5.8.*` | `v1.*` |
-| `v6.0.*` | `v6.0.*` |
+| `v6.*` | `v6.*` |
 
 You can install the package via composer:
 
 ```bash
-composer require goldspecdigital/laravel-eloquent-uuid:~v6.0
+composer require goldspecdigital/laravel-eloquent-uuid:^v6.0
 ```
 
 ## Usage

composer.json

@@ -28,7 +28,7 @@
     },
     "require": {
         "php": "^7.2",
-        "laravel/framework": "~6.0.0"
+        "laravel/framework": "^6.0"
     },
     "require-dev": {
         "ext-pdo": "*",