doc: update release notes

Update the release notes regarding the change in rpc getaddressinfo `labels`.
knst · Jan 3, 2020 · 8925df8 · 8925df8
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+Deprecated or removed RPCs
+--------------------------
+
+- The `getaddressinfo` RPC `labels` field now returns an array of label name
+  strings. Previously, it returned an array of JSON objects containing `name` and
+  `purpose` key/value pairs, which is now deprecated and will be removed in
+  0.21. To re-enable the previous behavior, launch bitcoind with
+  `-deprecatedrpc=labelspurpose`.