Make it clear we require node 18

packages/cbor/README.md

@@ -8,7 +8,7 @@ This project now only supports versions of Node that the Node team is
 [currently supporting](https://github.com/nodejs/Release#release-schedule).
 Ava's [support
 statement](https://github.com/avajs/ava/blob/main/docs/support-statement.md)
-is what we will be using as well.  Currently, that means Node `10`+ is
+is what we will be using as well.  Currently, that means Node `18`+ is
 required.  If you need to support an older version of Node (back to version
 6), use cbor version 5.2.x, which will get nothing but security updates from
 here on out.