Add HighwayHash (fffaraz#1570)

Author: toge

README.md

@@ -1181,6 +1181,7 @@ A curated list of awesome C++ (or C) frameworks, libraries, resources, and shiny
 * [gcc-poison](https://github.com/leafsr/gcc-poison) - A simple header file for developers to ban unsafe C/C++ functions from applications.
 * [happly](https://github.com/nmwsharp/happly) - A C++ header-only parser for the PLY file format. Parse .ply happily! [MIT]
 * [hedley](https://github.com/nemequ/hedley) - A C/C++ header file designed to smooth over some platform-specific annoyances. [website](https://nemequ.github.io/hedley/)
+* [HighwayHash](https://github.com/google/highwayhash) - Fast strong hash functions: SipHash/HighwayHash. [Apache-2.0]
 * [icecream-cpp](https://github.com/renatoGarcia/icecream-cpp) - A small printing library for debugging purposes. [MIT]
 * [inja](https://github.com/pantor/inja) - A Template Engine for Modern C++. [MIT]
 * [Jinja2С++](https://github.com/jinja2cpp/Jinja2Cpp) - almost full-conformance template engine implementation. [website](https://jinja2cpp.github.io/)