[ci] Fix macOS build
commit4741efa1288184bb698308db642b7d6a1dadc907
authorOlly Betts <olly@survex.com>
Wed, 6 Dec 2017 23:27:11 +0000 (7 12:27 +1300)
committerOlly Betts <olly@survex.com>
Wed, 6 Dec 2017 23:27:11 +0000 (7 12:27 +1300)
treebebffcd78ba7fa3f54cce083c5b787e60991c71a
parente49d0f360e5d7e9bb508f3b9493f36bba7e0128e
[ci] Fix macOS build

It seems the latest travis image has "pip2" instead of "pip".
.travis.yml