New protagonist needs C++11
New protagonist needs C++11

To be able to install newer Dredd, one will need a C++ compiler able to compile C++11. In the future we will eventually migrate to js-only parser by default and no compiler will be needed, but as of now, this change is needed in order to make Dredd work with Travis CI.

https://github.com/apiaryio/protagonist/blob/master/CHANGELOG.md#breaking
ddelnano/dredd-hooks-php,ddelnano/dredd-hooks-php