Rust 1.49.0 released

On this last day of 2020, the Rust project has announced the release of version 1.49.0 of the programming language. It establishes the arm64 Linux target as a Tier 1 platform, which is the highest level of support; "Tier 1 platforms can be thought of as 'guaranteed to work'". Also, arm64 macOS and Windows have risen to Tier 2 status, which means they are guaranteed to build and are likely to work just fine, but the automated tests are not run. Beyond that, the test framework now captures output from multiple threads and some library changes were made. See the detailed release notes for more information. "Rust 1.49.0 promotes the aarch64-unknown-linux-gnu target to Tier 1 support, bringing our highest guarantees to users of 64-bit ARM systems running Linux! We expect this change to benefit workloads spanning from embedded to desktops and servers.This is an important milestone for the project, since it's the first time a non-x86 target has reached Tier 1 support: we hope this will pave the way for more targets to reach our highest tier in the future.Note that Android is not affected by this change as it uses a different Tier 2 target."