Remove the cpp11 tag on Github

[vstumpf]

There's a cpp11 tag in the About window of the repo, yet it doesn't actually support c++11.

Can you please remove it.

[arun11299]

I am not sure what you mean by it doesn't support C++11. The code does not compile without atleast C++11 standard.

[vstumpf]

The README says

Support for C++11 seems trivial based on the changes required. Why not support C+11 then ?

Its 2018 now! If I ever start getting requests to have support for C++11, then I will surely consider it.

Is this no longer the case?

[arun11299]

Good catch. I really don't remember what is that about :). It certainly uses C++11 features, no doubt. Maybe I meant using C++14/17 std::string_view et al instead of hand rolled one. I will update the README.