Explicitly declare zeromq dependency in travis_php
Explicitly declare zeromq dependency in travis_php

dracos/travis-cookbooks,dracos/travis-cookbooks,spurti-chopra/travis-cookbooks,spurti-chopra/travis-cookbooks,travis-ci/travis-cookbooks,spurti-chopra/travis-cookbooks,ljharb/travis-cookbooks,ljharb/travis-cookbooks,dracos/travis-cookbooks,travis-ci/travis-cookbooks,travis-ci/travis-cookbooks,dracos/travis-cookbooks,ljharb/travis-cookbooks