Readme Doc should have instructions for use of --version

[majorthorn]

The readme should have a section for how to use --version when piping to bash.

Example

wget -q -O - https://raw.githubusercontent.com/canha/golang-tools-install-script/master/goinstall.sh \ | bash -s -- --version 1.13.1

[canha]

Was just thinking about it when I merged your original PR. If you get to it before me, feel free to submit another PR 😄

[majorthorn]

Will do! 😆