Reflect stage 3 on README (#61)

https://github.com/tc39/proposals#stage-3 indicates that the proposal was Stage 3 as of the July meeting, and the current open Issue is for Stage 4 advancement.
tc39 · Aug 1, 2023 · ffba1cb · ffba1cb
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commit ffba1cb
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/README.md b/README.md
@@ -29,7 +29,7 @@ Map.groupBy(array, (num, index) => {
 
 ## Status
 
-Current [Stage](https://tc39.es/process-document/): 2
+Current [Stage](https://tc39.es/process-document/): 3
 
 ## Motivation