CI/travis/macOS: fix missing pip3

homebrew or Travis changed something, now `pip3` isn't in $PATH.
`ls /usr/local/opt/python/libexec/bin` confirmed this, no matter what
brew reinstall/relink/upgrade are used.

Bumping the macOS image to 10.12 or 10.13 makes the problem go away.

    ==> Processing gcc49 formula rename to gcc@4.9
    ==> Unlinking gcc49
    ==> Moving gcc49 versions to /usr/local/Cellar/gcc@4.9
    ==> Relinking gcc@4.9
    Warning: gcc@4.9 is outdated!
    To avoid broken installations, as soon as possible please run:
      brew upgrade
    Or, if you're OK with a less reliable fix:
      brew upgrade gcc@4.9
    python info:
      Python 2.7.12
      Python 2.7.12
      ci/before_install.sh: line 18: python3: command not found
      pip 8.1.2 from /usr/local/lib/python2.7/site-packages (python 2.7)
      pip 8.1.2 from /usr/local/lib/python2.7/site-packages (python 2.7)
      ci/before_install.sh: line 21: pip3: command not found
      pyenv versions:
      * system (set by /Users/travis/.pyenv/version)
    Upgrade Python 3.
    To restore the stashed changes to /usr/local/Homebrew run:
      'cd /usr/local/Homebrew && git stash pop'
    ==> Caveats
    Python has been installed as
      /usr/local/bin/python3
    Unversioned symlinks `python`, `python-config`, `pip` etc. pointing to
    `python3`, `python3-config`, `pip3` etc., respectively, have been installed into
      /usr/local/opt/python/libexec/bin
    If you need Homebrew's Python 2.7 run
      brew install python@2
    Pip, setuptools, and wheel have been installed. To update them run
      pip3 install --upgrade pip setuptools wheel
    You can install Python packages with
      pip3 install <package>
    They will install into the site-package directory
      /usr/local/lib/python3.7/site-packages
    See: https://docs.brew.sh/Homebrew-and-Python
    ==> Summary
    º  /usr/local/Cellar/python/3.7.0: 8,864 files, 153.8MB, built in 6 minutes 32 seconds
    ...
    Upgrade Python 3 pip.
    ci/before_install.sh: line 30: pip3: command not found
    travis_time:end:0d23f522:start=1538818824750644000,finish=1538819451424021000,duration=626673377000
    The command "ci/before_install.sh" failed and exited with 127 during .
    Your build has been stopped.
    /Users/travis/.travis/job_stages: line 373: shell_session_update: command not found

    ==> Processing gcc49 formula rename to gcc@4.9
    ==> Unlinking gcc49
    ==> Moving gcc49 versions to /usr/local/Cellar/gcc@4.9
    ==> Relinking gcc@4.9
    Warning: gcc@4.9 is outdated!
    To avoid broken installations, as soon as possible please run:
      brew upgrade
    Or, if you're OK with a less reliable fix:
      brew upgrade gcc@4.9
    python info:
      Python 2.7.12
      Python 2.7.12
      ci/before_install.sh: line 18: python3: command not found
      pip 8.1.2 from /usr/local/lib/python2.7/site-packages (python 2.7)
      pip 8.1.2 from /usr/local/lib/python2.7/site-packages (python 2.7)
      ci/before_install.sh: line 21: pip3: command not found
      pyenv versions:
      * system (set by /Users/travis/.pyenv/version)
    Upgrade Python 3.
    To restore the stashed changes to /usr/local/Homebrew run:
      'cd /usr/local/Homebrew && git stash pop'
    ==> Caveats
    Python has been installed as
      /usr/local/bin/python3
    Unversioned symlinks `python`, `python-config`, `pip` etc. pointing to
    `python3`, `python3-config`, `pip3` etc., respectively, have been installed into
      /usr/local/opt/python/libexec/bin
    If you need Homebrew's Python 2.7 run
      brew install python@2
    Pip, setuptools, and wheel have been installed. To update them run
      pip3 install --upgrade pip setuptools wheel
    You can install Python packages with
      pip3 install <package>
    They will install into the site-package directory
      /usr/local/lib/python3.7/site-packages
    See: https://docs.brew.sh/Homebrew-and-Python
    ==> Summary
    º  /usr/local/Cellar/python/3.7.0: 8,864 files, 153.8MB, built in 6 minutes 32 seconds
    ...
    Upgrade Python 3 pip.
    ci/before_install.sh: line 30: pip3: command not found
    travis_time:end:0d23f522:start=1538818824750644000,finish=1538819451424021000,duration=626673377000
    The command "ci/before_install.sh" failed and exited with 127 during .
    Your build has been stopped.
    /Users/travis/.travis/job_stages: line 373: shell_session_update: command not found

0 files changed, 0 insertions, 0 deletions