Auto merge of #75723 - ehuss:update-cargo, r=ehuss

Auto merge of #75723 - ehuss:update-cargo, r=ehuss

Update cargo

5 commits in ab32ee88dade1b50c77347599e82ca2de3fb8a51..51b66125ba97d2906f461b3f4e0408f206299bb6
2020-08-10 17:44:43 +0000 to 2020-08-19 20:22:52 +0000
- Add chapters on dependency resolution and SemVer compatibility. (rust-lang/cargo#8609)
- Renames SourceId::into_url -> SourceId::as_url (rust-lang/cargo#8611)
- Fix bug with PathAndArg config values (rust-lang/cargo#8629)
- Show full error context on `cargo run` error. (rust-lang/cargo#8627)
- Fix typo in SIGQUIT description (rust-lang/cargo#8615)