forked from catchorg/Catch2
* Use Xenial as the base distribution * Remove C++11 builds * Add a lot more C++14 builds * Add some C++17 builds * Include newer versions of Clang and GCC
* Use Xenial as the base distribution * Remove C++11 builds * Add a lot more C++14 builds * Add some C++17 builds * Include newer versions of Clang and GCC