message: Add Travis-CI badge to README.md
  Show Travis-CI build status in the README.md so that it is easily seen while viewing the GitHub repo.
diff: # Vulkan-Hpp: C++ Bindings for Vulkan
  +## CI Build Status
  +| Platform | Build Status |
  +|:--------:|:------------:|
  +| Linux | [![Build Status](https://travis-ci.org/KhronosGroup/Vulkan-Hpp.svg?branch=master)](https://travis-ci.org/KhronosGroup/Vulkan-Hpp) |
  +
  The goal of the Vulkan-Hpp is to provide header only C++ bindings for the Vulkan C API to improve the developers Vulkan experience without introducing CPU runtime cost. It adds features like type safety for enums and bitfields, STL container support, exceptions and simple enumerations.
  # Getting Started
  