Update Documentation for Install

[luciddr34m3r]

As of Go 17, go get will not install this package and go install fails, so you must build it from source currently.

[ghost]

this helped me https://www.digitalocean.com/community/tutorials/how-to-build-and-install-go-programs

Also comments on THIS issue on the current repo, helps since the documentation does not mention that failure to part multiple.ini as it says it must

[ryan910]

FYI here are the instructions for GO above version 1.17

git clone https://github.com/zmap/zrab2.git
cd zgrab2
go build
cd into build directory, example: /home/user/go/pkg/mod/github.com/zmap/[email protected]
go mod download github.com/stretchr/testify
make
./zgrab2

[rful011]

the clone request prompts for password...

[rful011]

Ah! typo in the filename in the clone request: "zrab2.git"