As noted in #13, using pre-commit's native golang support for running
terraform-docs provides the ability for renovate to auto-update the
version as required. It also allows renovate to run terraform-docs
whenever a template is updated.

Hold off on moving tflint for the moment since tflint makes use of a
custom ruleset plugin which is non-trivial to install via pre-commit.

Closes #14

feat: make use of pre-commit's native golang support for terraform-docs

Closes #14

See merge request !54