message: bump rand dependency
diff: @@ -39,11 +39,13 @@ env_logger = "0.6"
  log = "0.4"
  shell-escape = "0.1.4"
  hex = "0.3.2"
  -rand = "0.6"
  +rand = "0.7"
  +
  # 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`
  # for more information.
  rustc-workspace-hack = "1.0.0"
  +
  # Depend on num-traits with default features to avoid having to rebuild
  # between "cargo build" and "cargo intall".
  num-traits = "*"
  