Fix/replace superclosure (#92)

* Replace deprecated SuperClosure module

* Add missing declaration

Author: alex-dna

composer.json

@@ -24,7 +24,7 @@
     "silverstripe/framework": "^4@dev",
     "silverstripe/cms": "^4@dev",
     "symbiote/silverstripe-queuedjobs": "^4.0.0",
-    "jeremeamia/superclosure": "^2.4"
+    "opis/closure": "^3.6"
   },
   "require-dev": {
     "phpunit/phpunit": "^5.7",

src/Extension/EmbargoExpiryFluentExtension.php

@@ -4,7 +4,7 @@
 
 use Exception;
 use SilverStripe\ORM\DataExtension;
-use SuperClosure\SerializableClosure;
+use Opis\Closure\SerializableClosure;
 use TractorCow\Fluent\State\FluentState;
 
 /**

src/Job/PublishTargetJob.php

@@ -4,7 +4,7 @@
 
 use SilverStripe\ORM\DataObject;
 use SilverStripe\Versioned\Versioned;
-use SuperClosure\SerializableClosure;
+use Opis\Closure\SerializableClosure;
 use Symbiote\QueuedJobs\Services\AbstractQueuedJob;
 use Terraformers\EmbargoExpiry\Extension\EmbargoExpiryExtension;
 

src/Job/UnPublishTargetJob.php

@@ -5,7 +5,7 @@
 use SilverStripe\CMS\Model\SiteTree;
 use SilverStripe\ORM\DataObject;
 use SilverStripe\Versioned\Versioned;
-use SuperClosure\SerializableClosure;
+use Opis\Closure\SerializableClosure;
 use Symbiote\QueuedJobs\Services\AbstractQueuedJob;
 use Terraformers\EmbargoExpiry\Extension\EmbargoExpiryExtension;