Updated changelog and alias for adapters (#144)

Author: Nyholm

CacheItem.php

@@ -180,6 +180,9 @@ public function getPreviousTags()
         return $this->prevTags;
     }
 
+    /**
+     * {@inheritdoc}
+     */
     public function getTags()
     {
         return $this->tags;

PhpCacheItem.php

@@ -19,7 +19,12 @@
 interface PhpCacheItem extends HasExpirationTimestampInterface, TaggableCacheItemInterface
 {
     /**
-     * Get the current tags. These are not the same tags as getPrevious tags.
+     * Get the current tags. These are not the same tags as getPrevious tags. This
+     * is the tags that has been added to the item after the item was fetched from
+     * the cache storage.
+     *
+     * WARNING: This is generally not the function you want to use. Please see
+     * `getPreviousTags`.
      *
      * @return array
      */