message: generic-array requires Rust 1.20; 1.23 is out so N-2 is fine
diff: @@ -27,7 +27,7 @@ jobs:
  build:
  working_directory: ~/build
  docker:
  - - image: rust:1.19.0
  + - image: rust:1.20.0
  environment:
  RUSTFLAGS: -D warnings
  - image: sfackler/rust-postgres-test:3
  