Bump cargo_toml from 0.12.4 to 0.13.0 (#486)

Bumps [cargo_toml](https://gitlab.com/crates.rs/cargo_toml) from 0.12.4 to 0.13.0.
- [Release notes](https://gitlab.com/crates.rs/cargo_toml/tags)
- [Commits](https://gitlab.com/crates.rs/cargo_toml/commits/master)

---
updated-dependencies:
- dependency-name: cargo_toml
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Cargo.lock

@@ -271,9 +271,9 @@ dependencies = [
 
 [[package]]
 name = "cargo_toml"
-version = "0.12.4"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a621d5d6d6c8d086dbaf1fe659981da41a1b63c6bdbba30b4dbb592c6d3bd49"
+checksum = "aa0e3586af56b3bfa51fca452bd56e8dbbbd5d8d81cbf0b7e4e35b695b537eb8"
 dependencies = [
  "serde",
  "toml",