Fixed #497 (#498)

* Added Wiki link in ISSUE_TEMPLATE.md

* Fixed #497

Author: Geolim4

src/phpFastCache/Helper/Psr16Adapter.php

@@ -142,6 +142,9 @@ public function setMultiple($values, $ttl = null)
         try {
             foreach ($values as $key => $value) {
                 $cacheItem = $this->internalCacheInstance->getItem($key)->set($value);
+                if ($ttl) {
+                    $cacheItem->expiresAfter($ttl);
+                }
                 $this->internalCacheInstance->saveDeferred($cacheItem);
                 unset($cacheItem);
             }