message: Travis: use bazelisk
  Instead of hard coding bazel versions, use bazelisk which will use .bazelversion.
  That has the canonical version that we use.
diff: @@ -11,10 +11,8 @@ before_install:
  - sudo add-apt-repository -y ppa:git-core/ppa
  - sudo apt-get update -q
  - sudo apt-get install -q -y git
  - - sudo apt-get install pkg-config zip g++ zlib1g-dev unzip python3 ninja-build cmake gperf memcached apache2-dev python2
  - - wget https://github.com/bazelbuild/bazel/releases/download/6.0.0-pre.20220720.3/bazel-6.0.0-pre.20220720.3-installer-linux-x86_64.sh
  - - chmod +x bazel-6.0.0-pre.20220720.3-installer-linux-x86_64.sh
  - - ./bazel-6.0.0-pre.20220720.3-installer-linux-x86_64.sh --user
  + - sudo apt-get install pkg-config zip g++ zlib1g-dev unzip python3 ninja-build cmake gperf memcached apache2-dev python2 npm
  + - sudo npm install -g @bazel/bazelisk
  - wget https://apt.llvm.org/llvm.sh
  - chmod +x llvm.sh
  - sudo ./llvm.sh 14
  