Unity tools for develop
This code use C#6.0 syntax.
So if you want to use, set 'Scripting Runtime Version' option to
'Experimental (.NET 4.6 Equivalent)' not 'Stable (.NET 3.5 Equivalent)'.
or just rewrite code.
You can find option [Edit]-[Project Setting]-[Player] and under Configuration in Inspector window.
YOUR-PROJECT-ROOT/Assets# git clone https://github.com/cupsos/MhuUtility.git
It tested on Unity 2017.2.0f3 Windows 10