docs: Update collections README with HashMap link

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lauralindzey 2021-07-06 01:31:27 -07:00 committed by GitHub
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@ -20,3 +20,4 @@ structures that are used very often in Rust programs:
## Further information ## Further information
- [Storing Lists of Values with Vectors](https://doc.rust-lang.org/stable/book/ch08-01-vectors.html) - [Storing Lists of Values with Vectors](https://doc.rust-lang.org/stable/book/ch08-01-vectors.html)
- [Storing Keys with Associated Values in Hash Maps](https://doc.rust-lang.org/book/ch08-03-hash-maps.html)