Update null label version to fully support 0.13.X

[ankitm123]

Describe the Bug

Module does not have support for v0.13.X

Expected Behavior

It supports 0.13.X according to release notes

Steps to Reproduce

Steps to reproduce the behavior:

1. Clone the repo
2. Run terraform init

Error:

Error: Unsupported Terraform Core version

  on .terraform/modules/base_label/versions.tf line 2, in terraform:
   2:   required_version = "~> 0.12.0"

Module module.base_label (from
git::https://github.com/cloudposse/terraform-null-label.git?ref=tags/0.16.0)
does not support Terraform version 0.13.0. To proceed, either choose another
supported Terraform version or update this version constraint. Version
constraints are normally set for good reason, so updating the constraint may
lead to other errors or unexpected behavior.


Error: Unsupported Terraform Core version

  on .terraform/modules/dynamodb_table_label/versions.tf line 2, in terraform:
   2:   required_version = "~> 0.12.0"

Module module.dynamodb_table_label (from
git::https://github.com/cloudposse/terraform-null-label.git?ref=tags/0.16.0)
does not support Terraform version 0.13.0. To proceed, either choose another
supported Terraform version or update this version constraint. Version
constraints are normally set for good reason, so updating the constraint may
lead to other errors or unexpected behavior.


Error: Unsupported Terraform Core version

  on .terraform/modules/s3_bucket_label/versions.tf line 2, in terraform:
   2:   required_version = "~> 0.12.0"

Module module.s3_bucket_label (from
git::https://github.com/cloudposse/terraform-null-label.git?ref=tags/0.16.0)
does not support Terraform version 0.13.0. To proceed, either choose another
supported Terraform version or update this version constraint. Version
constraints are normally set for good reason, so updating the constraint may
lead to other errors or unexpected behavior.

Environment (please complete the following information):

Anything that will help us triage the bug will help. Here are some ideas:

• OS: Ubuntu 20.04.1
• Version: master

Additional Context

The issue is that the 0.16.0 version of the null label package, does not support 0.13.0 version of terraform. It just needs to be updated to 0.17.0.