Lock Travis distro so new defaults will not break the build #37
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Travis is in the process of upgrading the base distro (https://blog.travis-ci.com/2017-07-11-trusty-as-default-linux-is-coming) and despite all PRs currently being "green", will soon start to mark the current master as broken.
While updating the default distro, they also removed support for some older versions of PHP (travis-ci/travis-ci#7163). These versions are still supported by this project, so we now have to explicitly define the base distro to test against.
Builds on top of #35
Originally from clue/reactphp-connection-manager-extra#24