Add Laravel 6 compatibility

.gitignore

@@ -2,4 +2,5 @@ build
 composer.lock
 docs
 vendor
-coverage
+coverage
+.phpunit.result.cache

composer.json

@@ -17,18 +17,18 @@
     ],
     "require": {
         "php": "^7.1",
-        "illuminate/container": "^5.7|^5.8",
-        "illuminate/database": "^5.7|^5.8",
-        "illuminate/log": "^5.7|^5.8",
-        "illuminate/routing": "^5.7|^5.8",
-        "illuminate/support": "^5.7|^5.8",
+        "illuminate/container": "^5.7|^5.8|^6.0",
+        "illuminate/database": "^5.7|^5.8|^6.0",
+        "illuminate/log": "^5.7|^5.8|^6.0",
+        "illuminate/routing": "^5.7|^5.8|^6.0",
+        "illuminate/support": "^5.7|^5.8|^6.0",
         "willdurand/email-reply-parser": "^2.8",
         "zbateson/mail-mime-parser": "^1.1"
     },
     "require-dev": {
         "mockery/mockery": "^1.2",
-        "orchestra/testbench": "^3.7|^3.8",
-        "phpunit/phpunit": "^7.0",
+        "orchestra/testbench": "^3.7|^3.8|^4.0",
+        "phpunit/phpunit": "^7.0|^8.0",
         "zendframework/zend-mail": "^2.10"
     },
     "autoload": {

src/InboundEmail.php

@@ -8,6 +8,7 @@
 use EmailReplyParser\EmailReplyParser;
 use Illuminate\Contracts\Mail\Mailable;
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Support\Str;
 use ZBateson\MailMimeParser\Header\AddressHeader;
 use ZBateson\MailMimeParser\Message as MimeMessage;
 use ZBateson\MailMimeParser\Header\Part\AddressPart;
@@ -42,7 +43,7 @@ public static function fromMessage($message)
 
     public function id(): string
     {
-        return $this->message()->getHeaderValue('Message-Id', str_random());
+        return $this->message()->getHeaderValue('Message-Id', Str::random());
     }
 
     public function date(): Carbon