Merge pull request #15 from umpirsky/symfony4

Update deps

Author: umpirsky

.travis.yml

@@ -1,10 +1,6 @@
 language: php
 php:
-    - 5.3
-    - 5.4
-    - 5.5
-    - 5.6
-    - hhvm
+    - 7.1
 
 install:
     - composer install

composer.json

@@ -10,12 +10,12 @@
         }
     ],
     "require": {
-        "php": ">=5.3",
-        "symfony/process": "~2.3|~3.0"
+        "php": "^7.1",
+        "symfony/process": "^2.3|^3.0|^4.0"
     },
     "require-dev": {
-        "composer/composer": "1.0.*@dev",
-        "phpspec/phpspec": "~2.0"
+        "composer/composer": "^1.7",
+        "phpspec/phpspec": "^5.0"
     },
     "autoload": {
         "psr-0": { "Umpirsky\\PermissionsHandler": "src" }