Update env_logger requirement from 0.6 to 0.7 (#1786)

Updates the requirements on [env_logger](https://github.com/sebasmagri/env_logger) to permit the latest version.
- [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@v0.6.0...v0.7.0)

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

Author: dependabot-preview[bot]

crates/cli/Cargo.toml

@@ -16,7 +16,7 @@ edition = '2018'
 [dependencies]
 curl = "0.4.13"
 docopt = "1.0"
-env_logger = "0.6"
+env_logger = "0.7"
 failure = "0.1.2"
 log = "0.4"
 openssl = { version = '0.10.11', optional = true }

crates/web-sys/Cargo.toml

@@ -20,7 +20,7 @@ doctest = false
 test = false
 
 [build-dependencies]
-env_logger = { version = "0.6.0", optional = true }
+env_logger = { version = "0.7.0", optional = true }
 failure = "0.1.2"
 wasm-bindgen-webidl = { path = "../webidl", version = "=0.2.50" }
 sourcefile = "0.1"

crates/webidl-tests/Cargo.toml

@@ -11,7 +11,7 @@ path = 'lib.rs'
 
 [build-dependencies]
 wasm-bindgen-webidl = { path = '../webidl' }
-env_logger = "0.6"
+env_logger = "0.7"
 
 [dev-dependencies]
 js-sys = { path = '../js-sys' }