message: bump env_logger
diff: @@ -37,7 +37,7 @@ byteorder = { version = "1.1", features = ["i128"]}
  cargo_metadata = { version = "0.6", optional = true }
  directories = { version = "1.0", optional = true }
  rustc_version = { version = "0.2.3", optional = true }
  -env_logger = "0.5"
  +env_logger = "0.6"
  log = "0.4"
  # A noop dependency that changes in the Rust repository, it's a bit of a hack.
  # See the `src/tools/rustc-workspace-hack/README.md` file in `rust-lang/rust`
  