Fix symfony 3.x require version strings

Author: LeeSaferite

composer.json

@@ -16,8 +16,8 @@
     },
     "require": {
         "php": ">=5.4",
-        "symfony/filesystem": "~2.3|3.0",
-        "symfony/process": "~2.3|3.0",
+        "symfony/filesystem": "^2.3 || ^3.0",
+        "symfony/process": "^2.3 || ^3.0",
         "jane/open-api": "^1.0",
         "php-http/socket-client": "^1.0",
         "php-http/plugins": "^1.0.1",