Bump cargo_metadata from 0.6.4 to 0.7.0

Bumps [cargo_metadata](https://github.com/oli-obk/cargo_metadata) from 0.6.4 to 0.7.0.
- [Release notes](https://github.com/oli-obk/cargo_metadata/releases)
- [Commits](https://github.com/oli-obk/cargo_metadata/commits)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot-support

Cargo.lock

@@ -20,7 +20,7 @@ test = false
 
 [dependencies]
 cargo = { git = "https://github.com/rust-lang/cargo", rev = "907c0febe7045fa02dff2a35c5e36d3bd59ea50d" }
-cargo_metadata = "0.6"
+cargo_metadata = "0.7"
 clippy_lints = { git = "https://github.com/rust-lang/rust-clippy", rev = "280069ddc750d8a20d075c76322c45d5db4a48f8", optional = true }
 env_logger = "0.6"
 failure = "0.1.1"