Enable instalation for symfony 4

Author: caciobanu

.travis.yml

@@ -12,6 +12,10 @@ matrix:
       env: SYMFONY_VERSION=2.8.*
     - php: 7.1
       env: SYMFONY_VERSION=3.3.*
+    - php: 7.1
+      env: SYMFONY_VERSION=3.4.*
+    - php: 7.1
+      env: SYMFONY_VERSION=4.0.*
 
 env:
   global:

composer.json

@@ -19,10 +19,10 @@
     "require": {
         "php": "^5.6 || ^7.0",
         "simple-bus/message-bus": "~3.0",
-        "symfony/http-kernel": "~2.3 || ~3.0",
-        "symfony/dependency-injection": "~2.3 || ~3.0",
-        "symfony/yaml": "~2.3 || ~3.0",
-        "symfony/config": "~2.3 || ~3.0"
+        "symfony/http-kernel": "~2.3 || ~3.0 || ~4.0",
+        "symfony/dependency-injection": "~2.3 || ~3.0 || ~4.0",
+        "symfony/yaml": "~2.3 || ~3.0 || ~4.0",
+        "symfony/config": "~2.3 || ~3.0 || ~4.0"
     },
     "suggest": {
         "simple-bus/doctrine-orm-bridge": "For integration with Doctrine ORM",
@@ -35,8 +35,8 @@
         "simple-bus/doctrine-orm-bridge": "~5.0",
         "doctrine/orm": "~2.3",
         "doctrine/doctrine-bundle": "~1.0",
-        "symfony/monolog-bridge": "~2.3 || ~3.0",
-        "symfony/monolog-bundle": "~2.3 || ~3.0"
+        "symfony/monolog-bridge": "~2.3 || ~3.0 || ~4.0",
+        "symfony/monolog-bundle": "~2.3 || ~3.0 || ~4.0"
     },
     "autoload": {
         "psr-4": {