Test Laravel 5.5/5.6/5.7 too

.travis.yml

@@ -9,10 +9,13 @@ php:
   - 5.5
 
 env:
-  - LARAVEL_VERSION=5.1.*
-  - LARAVEL_VERSION=5.2.*
-  - LARAVEL_VERSION=5.3.*
+  - LARAVEL_VERSION=5.7.*
+  - LARAVEL_VERSION=5.6.*
+  - LARAVEL_VERSION=5.5.*
   - LARAVEL_VERSION=5.4.*
+  - LARAVEL_VERSION=5.3.*
+  - LARAVEL_VERSION=5.2.*
+  - LARAVEL_VERSION=5.1.*
 
 matrix:
   fast_finish: true
@@ -26,7 +29,7 @@ before_script:
   - git clone --depth=50 --branch=master git://github.com/aimeos/aimeos-core.git ../aimeos-core
   - cd ../aimeos-core
   - mv ../ai-laravel ext/
-  - travis_retry composer require "laravel/framework:${LARAVEL_VERSION}" "symfony/psr-http-message-bridge:dev-master" "zendframework/zend-diactoros:~1.0"
+  - travis_retry composer require "laravel/framework:${LARAVEL_VERSION}" "symfony/psr-http-message-bridge:~1.0" "zendframework/zend-diactoros:~1.0"
   - mysql -e 'create database aimeos;'
   - echo "<?php return array( 'db' => array( 'adapter' => 'mysql', 'host' => '127.0.0.1', 'database' => 'aimeos', 'username' => 'root', 'password' => '', 'limit' => 2, 'opt-persistent' => false, 'stmt' => array( \"SET SESSIOn sort_buffer_size=2097144; SET NAMES 'utf8'; SET SESSION sql_mode='ANSI'\" ) ), 'mq' => array( 'adapter' => 'Standard', 'db' => 'db' ) );" > config/resource.php