Upgrade oneup/flysystem-bundle

Make flysystem-process-bundle compatible with Symfony 4

Author: xaviermarchegay

composer.json

@@ -39,7 +39,7 @@
     },
     "require": {
         "cleverage/process-bundle": "3.*|dev-v3.0-dev",
-        "oneup/flysystem-bundle": ">1.0,<3.0"
+        "oneup/flysystem-bundle": ">1.0,<4.0"
     },
     "require-dev": {
         "phpunit/phpunit": "~6.4"