Update beginner/README.md

Co-authored-by: Lotte Steenbrink <lotte@zombietetris.de>
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Jorge Aparicio 2020-06-25 09:01:47 +00:00 committed by GitHub
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@ -446,7 +446,7 @@ Our suggestion is to use a dictionary / map. `std::collections::HashMap` is not
[`heapless`]: https://docs.rs/heapless
[crates.io]: https://crates.io/crates/heapless
``` toml
``` rust
use heapless::IndexMap; // a dictionary / map
use heapless::Vec; // like `std::Vec` but stack-allocated
```