tweak the 4th newsletter

Author: japaric

newsletters/2018-04-28.md

@@ -31,7 +31,7 @@ If you have an embedded project or blog post you would like to have featured in
 * [Daniel] started work on [`bluetooth-hci`], an abstraction layer for HCI based Bluetooth Controllers, and is using it in his [`bluenrg`] crate for STMicro's BlueNRG RF modules
 * [cr1901] shared his [`AT2XT`] project, an adapter that allows use of low cost PS2 keyboards with older computers that expect (now very expensive) XT keyboards. The firmware for this project is based on `rtfm`, and runs on an `msp430` microcontroller. Check out the [short blurb] by [cr1901] summarizing the project
 * [hannobraun] released v0.3 of his [`lpc82x`] Chip Support Crate for NXP's LPC82x family of microcontrollers, as well as v0.1 of [`lpc82x-hal`]. Check out the [lpc82x-hal announcement] here!
-* [japaric] released v0.3.1 of [`heapless`], a crate for fixed capacity implementations of `HashMap` and `HashSet` that does not require the use of `std`, an allocator, and used `u32` hashes (instead of the default `u64`).
+* [japaric] released v0.3.1 of [`heapless`] which now contains fixed capacity implementations of `HashMap` and `HashSet` that work on `no_std`, do not require an allocator, and use `u32` hashes (instead of the default `u64`).
 
 [`AT2XT`]: https://github.com/cr1901/AT2XT
 [cr1901]: https://github.com/cr1901
@@ -72,4 +72,4 @@ As part of the [Weekly Driver Initiative], crates that are part of the `embedded
 * Progress is being made towards [Stable Embedded Rust], try out the current preview, and we would love some feedback!
 
 [Stable Embedded Rust]: https://github.com/rust-lang-nursery/embedded-wg/issues/42#issuecomment-384524779
-[Rustfest Impl Period]: https://github.com/rust-lang-nursery/embedded-wg/issues/90
+[Rustfest Impl Period]: https://github.com/rust-lang-nursery/embedded-wg/issues/90