docs: cleaned up installation command in readme

[SHA65536]

Instead of cloning and building switched to using go install

[baruchiro]

@SHA65536 Thank you for your contribution!
I wanted to do that before, but the compiled code is not included in our repository.

Now I read the go help install and I understand the go install command is compiling the source code, and saving the output executable.

Am I right?

[SHA65536]

Yes, go install will download and build the project into $GOPATH/bin, which should be inside the path. Making the install much easier and cleaner.