Merge pull request #1 from hans2103/patch-1

tiny correction in code

object-cache.php

@@ -832,7 +832,7 @@ class WP_Object_Cache {
 			return true;
 		}
 
-		if ( $this->redis-exists( $derived_key ) ) {
+		if ( $this->redis->exists( $derived_key ) ) {
 			return false;
 		}
 
@@ -1010,4 +1010,4 @@ class WP_Object_Cache {
 
 		return false;
 	}
-}
\ No newline at end of file
+}