update README

README.md

@@ -42,12 +42,10 @@ We should explore how to make this more ergonomic and functional.
 
 ## chosen solution
 
-See the [November 2023 presentation to committee](https://docs.google.com/presentation/d/1wMUfikXIIz7woLN-5MbYbW8an40c8ZPrN1ehzWVf4zw).
-
-A combination of variadic `Iterator.from` and `Iterator.prototype.flat`.
+See the [June 2024 presentation to committee](https://docs.google.com/presentation/d/1gOs4UDAcaIF6Dc9z1qXus-ljizrRTSty5O-GbcM9NTs).
 
 ```js
-let digits = Iterator.from(lows, [4, 5], highs);
+let digits = Iterator.concat(lows, [4, 5], highs);
 ```
 
 ```js
@@ -56,7 +54,7 @@ function* p() {
     yield Array(n).fill(n);
   }
 }
-let repeatedNats = p().flat();
+let repeatedNats = p().flatMap(x => x);
 ```
 
 ## considered design space