Lock Travis distro so new defaults will not break the build #106
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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", may start to mark the current master as broken. Unlike reactphp/stream#110 this project is not affected by Travis dropping support for older versions of PHP.
Builds on top of #105
Originally from clue/reactphp-connection-manager-extra#24