Update collection library (#31)

* bump tightenco/collect version to 5.4+

* adjust required php to 5.6+

* update collection usage

composer.json

@@ -16,8 +16,8 @@
     },
     "license": "MIT",
     "require": {
-        "php": "^5.6 | ^7.0",
-        "tightenco/collect": "5.2.*"
+        "php": ">=5.6",
+        "tightenco/collect": "^5.4"
     },
     "require-dev": {
         "phpunit/phpunit": "^5.0",

src/Event/Hook.php

@@ -156,7 +156,7 @@ public function shouldInvoke(array $arguments)
          * Check if any of the conditions returns false,
          * if so, do not invoke.
          */
-        return ! $this->conditions()->contains(function ($key, $callback) use ($arguments) {
+        return ! $this->conditions()->contains(function ($callback) use ($arguments) {
             return false === $callback->callArray($arguments);
         });
     }

src/PostType/PostType.php

@@ -110,7 +110,7 @@ public function supports($features)
         }
 
         return ! Collection::make($features)
-            ->contains(function ($key, $feature) {
+            ->contains(function ($feature) {
                 return ! post_type_supports($this->id(), $feature);
             });
     }