Broken links on crates.io

[GreenPenguino]

The relative links in README.md are broken on crates.io. The links work correctly on Github. It seems like the base URL on crates.io is incorrect.

Working and broken example: Link on Github: https://github.com/nrf-rs/nrf-hal/blob/master/nrf51-hal (works correctly) Link on crates.io: https://github.com/nrf-rs/nrf-hal/blob/nrf51-hal (does not work)

The issue is the missing /master/ between blob and the location name. This issue breaks all the relative links in README.md on crates.io.