message: ci: bump toolchain for lints on Travis
  This updates rustfmt and clippy to latest stable toolchain, for
  Travis jobs.
diff: @@ -35,7 +35,7 @@ jobs:
  - cargo test --release
  - name: "Lints with pinned toolchain"
  arch: amd64
  - rust: 1.44.0
  + rust: 1.45.2
  before_script:
  - rustup component add clippy
  - rustup component add rustfmt
  