message: travis: Don't output bazel progress.
  Fixes
diff: @@ -15,8 +15,8 @@ before_install:
  - sudo dpkg -i bazel_1.1.0-linux-x86_64.deb
  script:
  - - bazel build --cxxopt='-std=c++17' //...
  - - bazel test --cxxopt='-std=c++17' //...
  + - bazel build --noshow_progress --cxxopt='-std=c++17' //...
  + - bazel test --noshow_progress --cxxopt='-std=c++17' //...
  after_failure:
  - source .github/travis/output-logs.sh
  