Matrix build

.travis.yml

@@ -1,15 +1,30 @@
 language: php
 
+sudo: false
+
 php:
   - 7.1
   - 7.2
   - 7.3
 
-sudo: false
+env:
+  matrix:
+    - LARAVEL=5.7.*
+    - LARAVEL=5.8.*
+    - LARAVEL=dev-master
+
+matrix:
+  fast_finish: true
+  exclude:
+    - php: 7.1
+      env: LARAVEL=dev-master
+  allow_failures:
+    - env: LARAVEL=dev-master
 
 before_install:
   - phpenv config-rm xdebug.ini || true
 
-install: travis_retry composer install --no-interaction --prefer-source
+install:
+  - travis_retry composer require "illuminate/contracts=${LARAVEL}" --dev --prefer-dist --no-interaction --no-suggest
 
 script: vendor/bin/phpunit --verbose

composer.json

@@ -17,12 +17,12 @@
         "php": "^7.1.3",
         "ext-json": "*",
         "dompdf/dompdf": "^0.8.0",
-        "illuminate/contracts": "~5.7.0|~5.8.0",
-        "illuminate/database": "~5.7.0|~5.8.0",
-        "illuminate/http": "~5.7.0|~5.8.0",
-        "illuminate/routing": "~5.7.0|~5.8.0",
-        "illuminate/support": "~5.7.0|~5.8.0",
-        "illuminate/view": "~5.7.0|~5.8.0",
+        "illuminate/contracts": "~5.7.0|~5.8.0|~5.9.0",
+        "illuminate/database": "~5.7.0|~5.8.0|~5.9.0",
+        "illuminate/http": "~5.7.0|~5.8.0|~5.9.0",
+        "illuminate/routing": "~5.7.0|~5.8.0|~5.9.0",
+        "illuminate/support": "~5.7.0|~5.8.0|~5.9.0",
+        "illuminate/view": "~5.7.0|~5.8.0|~5.9.0",
         "nesbot/carbon": "^1.26.3|^2.0",
         "stripe/stripe-php": "~6.0",
         "symfony/http-kernel": "~4.0"