Update bootstrap-gruntwork-installer.sh

[iancoralogix]

Description

The header of the bootstrap script uses an older tag as an example:

$ curl -Ls https://raw.githubusercontent.com/gruntwork-io/gruntwork-installer/master/bootstrap-gruntwork-installer.sh | bash /dev/stdin --version 0.0.3

Installing gruntwork-install version 0.0.3 to /usr/local/bin/gruntwork-install

What we want to see is:

$ curl -Ls https://raw.githubusercontent.com/gruntwork-io/gruntwork-installer/master/bootstrap-gruntwork-installer.sh | bash /dev/stdin --version v0.0.38
Installing gruntwork-install version v0.0.38 to /usr/local/bin/gruntwork-install

TODOs

Read the Gruntwork contribution guidelines.

• Update the docs.
• Run the relevant tests successfully, including pre-commit checks.
• Include release notes. If this PR is backward incompatible, include a migration guide.

Release Notes (draft)

Added / Removed / Updated [X].

Migration Guide

[rhoboat]

LGTM! Thanks for these improvements! ❤️