update 302 to FOUND

https://tools.ietf.org/html/rfc7231#section-6.4.3

Author: koriym

src/StatusCode.php

@@ -39,7 +39,7 @@ final class StatusCode
     // 30X Redirection
     const MULTIPLE_CHOICES = 300;
     const MOVED_PERMANENTLY = 301;
-    const MOVED_TEMPORARILY = 302;
+    const FOUND = 302;
     const SEE_OTHER = 303;
     const NOT_MODIFIED = 304;
     const USE_PROXY = 305;