Add Hunter to “Build Systems” section.

Author: headupinclouds

README.md

@@ -752,6 +752,7 @@ A curated list of awesome C/C++ frameworks, libraries, resources, and shiny thin
 * [Conan](https://conan.io/) - C/C++ Package Manager, open sourced. [MIT]
 * [CPM](https://github.com/iauns/cpm) - A C++ Package Manager based on CMake and Git.
 * [FASTBuild](http://www.fastbuild.org/docs/home.html) - High performance, open-source build system supporting highly scalable compilation, caching and network distribution.
+* [Hunter](https://www.github.com/ruslo/hunter) - CMake driven cross-platform package manager for C++. [BSD-2]
 * [MesonBuild](http://mesonbuild.com) - An open source build system meant to be both extremely fast, and, even more importantly, as user friendly as possible.
 * [Ninja](https://ninja-build.org/) - A small build system with a focus on speed.
 * [Scons](http://www.scons.org/) - A software construction tool configured with a Python script.