message: Update documentation of Python support
diff: @@ -6,7 +6,7 @@ MaterialX is an open standard for transfer of rich material and look-development
  - Download the latest version of the [CMake](https://cmake.org) build system.
  - Point CMake to the root of the MaterialX library and generate C++ projects for your platform and compiler.
  -- Select the `MATERIALX_BUILD_PYTHON` option to build Python 2.x bindings.
  +- Select the `MATERIALX_BUILD_PYTHON` option to build Python bindings.
  ### Supported Platforms
  @@ -16,7 +16,7 @@ The MaterialX codebase requires a compiler with support for C++11, and can be bu
  - GCC 4.8 or newer
  - Clang 3.3 or newer
  -The Python bindings for MaterialX are based on [PyBind11](https://github.com/pybind/pybind11), and currently support Python 2.6.x and Python 2.7.x.
  +The Python bindings for MaterialX are based on [PyBind11](https://github.com/pybind/pybind11), and currently support Python versions 2.6, 2.7, and 3.x.
  ### Building MaterialX Python
  