Update the VTK-m requirements in README.md
The VTK-m requirements seem out of date. For starters, it says it works with a C++11 compiler when we now need a C++14 compile. I'm sure other dependencies need to be updated.
The VTK-m requirements seem out of date. For starters, it says it works with a C++11 compiler when we now need a C++14 compile. I'm sure other dependencies need to be updated.