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Update /vendor/README.md

since the vendor already stable since 1.5, update the doc to remove the note on vendor still experiment.
Z
Zidni Mubarok committed
a156be9f5c13815dfa79a5439326b25f0d2666f6
Parent: 8ce8aef
Committed by GitHub <noreply@github.com> on 11/9/2023, 1:03:33 PM