Update Cargo link

Unix was a mistake

_episodes/028-rust-1.44-1.45.md

@@ -32,7 +32,7 @@ Rustacean Station is a community project; get in touch with us if you'd like to
 
 #### [@01:21] - [Rust 1.44](https://blog.rust-lang.org/2020/06/04/Rust-1.44.0.html)
 
- - [@01:50] - [`cargo tree` subcommand](https://github.com/rust-lang/rust/blob/master/RELEASES.md#cargo-2)
+ - [@01:50] - [`cargo tree` subcommand](https://github.com/rust-lang/cargo/pull/8062/)
  - [@04:52] - [`async`/`await` in `#[no_std]` contexts](https://github.com/rust-lang/rust/pull/69033/)
  - [@12:16] - [Unicode 13 is now supported](https://github.com/rust-lang/rust/pull/69929/)
  - [@17:16] - [rustc now respects the -C codegen-units flag in incremental mode](https://github.com/rust-lang/rust/pull/70156/)