Support terraform Terraform v0.15 and above

[BnkColon]

I created an image with Terraform v1.3.7 and covalence-0.9.9. When I try to run terraform against it, it returns

Too many command line arguments. Did you mean to use -chdir?

According to the terraform upgrade guides, is because they changed the way we switch working directory.

The error message Terraform returned is suggesting that you use the -chdir option, like this:

terraform -chdir=./terraform init -input=false -backend=false
terraform -chdir=./terraform validate

Can covalence support this upgrade?

---

Version validations:

'terraform version'
...
Status: Downloaded newer image for <Name>:0.1.3
Terraform v1.3.7
on linux_amd64

Your version of Terraform is out of date! The latest version
is 1.3.8. You can update by downloading from https://www.terraform.io/downloads.html

'bundle show covalence'
/opt/gems/ruby/2.5.0/gems/covalence-0.9.9