fix

app/code/Joshine/InstagramFeed/Block/MediaFeed.php

@@ -113,7 +113,6 @@ class MediaFeed extends Template {
 
     public function cacheFeed($feed)
     {
-        var_dump($this->_cacheState->isEnabled(Type::TYPE_IDENTIFIER));
         if ($this->_cacheState->isEnabled(Type::TYPE_IDENTIFIER)) {
             $this->save($feed, $this->id);
         }

app/code/Joshine/InstagramFeed/Model/Cache/Type.php

+<?php
+namespace Joshine\InstagramFeed\Model\Cache;
+
+use Magento\Framework\App\Cache\Type\FrontendPool;
+use Magento\Framework\Cache\Frontend\Decorator\TagScope;
+
+class Type extends TagScope
+{
+    const TYPE_IDENTIFIER = 'instagram_feed';
+
+    const CACHE_TAG = 'INSTAGRAM_FEED';
+
+    const CACHE_LIFETIME = 60 * 60;
+
+    /**
+     * @param FrontendPool $cacheFrontendPool
+     */
+    public function __construct(FrontendPool $cacheFrontendPool)
+    {
+        parent::__construct($cacheFrontendPool->get(self::TYPE_IDENTIFIER), self::CACHE_TAG);
+    }
+
+}