message: fix(CI): Re-enable Stable builds on Linux
  It is unclear why the default build isn't running anymore.  `trust`
  explicitly calls it out now as well.
diff: sudo: false
  language: rust
  -rust: stable
  env:
  global:
  - CRATE_NAME=cobalt
  - # default job
  - - TARGET=x86_64-unknown-linux-gnu
  matrix:
  fast_finish: true
  include:
  # Linux
  - # - env: TARGET=x86_64-unknown-linux-gnu # this is the default job
  + - env: TARGET=x86_64-unknown-linux-gnu
  # OSX
  - env: TARGET=x86_64-apple-darwin
  