.travis.yml modern

[denji]

https://travis-ci.org/pmwkaa/ioarena

• { os: osx, xcode(8.3-9.1) } LLVM/Clang, deps library via brew
• { dist: trusty, os: linux }
  • clang-4.0 & clang-5.0?
  • GCC 5 & GCC 6