Update composer.json

Author: barryvdh

Diff for: composer.json

@@ -11,9 +11,9 @@
     ],
     "require": {
         "php": ">=5.6.4",
-        "illuminate/support": "5.4.x|5.5.x",
-        "illuminate/console": "5.4.x|5.5.x",
-        "symfony/process": "~3.2"
+        "illuminate/support": "5.4.x|5.5.x|5.6.x",
+        "illuminate/console": "5.4.x|5.5.x|5.6.x",
+        "symfony/process": "^3.2|^4"
     },
     "autoload": {
         "psr-4": {