Merge pull request #7 from fink3l/hotfix/compatibility-with-symfony-p…

…rocess

change depends symfony/process package version to < 4.2

composer.json

@@ -24,7 +24,7 @@
         }
     ],
     "require": {
-        "symfony/process": "~2.8|~3.0|~4.0",
+        "symfony/process": ">2.0,<4.2",
         "symfony/filesystem": "~2.8|~3.0|~4.0",
         "symfony/options-resolver": "~2.8|~3.0|~4.0",
         "php": "^5.6 || ^7.0"