Bump env_logger from 0.6.2 to 0.7.0

Bumps [env_logger](https://github.com/sebasmagri/env_logger) from 0.6.2 to 0.7.0.
- [Release notes](https://github.com/sebasmagri/env_logger/releases)
- [Changelog](https://github.com/sebasmagri/env_logger/blob/master/CHANGELOG.md)
- [Commits](rust-cli/env_logger@v0.6.2...v0.7.0)

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

Author: dependabot-preview[bot]

Cargo.lock

@@ -6,7 +6,7 @@ edition = '2018'
 
 [dependencies]
 clap = "2.25"
-env_logger = "0.6"
+env_logger = "0.7"
 failure = "0.1.1"
 log = "0.4"
 serde = { version = "1", features = ["derive"] }

collector/Cargo.toml

@@ -5,7 +5,7 @@ version = "0.1.0"
 edition = '2018'
 
 [dependencies]
-env_logger = "0.6"
+env_logger = "0.7"
 failure = "0.1"
 futures-preview = { version = "0.3.0-alpha.19", features = ["compat"] }
 log = "0.4"