chore: update README

Author: ccharly

README.md

@@ -48,7 +48,6 @@ linkStyle default opacity:0.5
   keyring_snap_sdk(["@metamask/keyring-snap-sdk"]);
   keyring_utils(["@metamask/keyring-utils"]);
   account_api --> keyring_api;
-  account_api --> keyring_utils;
   account_api --> keyring_internal_api;
   keyring_api --> keyring_utils;
   eth_hd_keyring --> keyring_utils;