Auto merge of #66964 - ehuss:update-beta-cargo, r=alexcrichton

[beta] Update cargo

1 commits in 5da4b4d47963868d9878480197581ccbbdaece74..bc8e4c8be13c8f8d1583f9d52e55fda038c0f9d4
2019-10-28 21:53:41 +0000 to 2019-11-22 17:45:44 +0000
- [beta] Extend documentation on security concerns of crate names in a registry. (rust-lang/cargo#7619)

Author: bors