v0.12.0

context.tf updated to v0.24.1, minimum required Terraform version bumped to 0.13.0 when needed, readme updated @maximmi (#33)

what

• update context.tf to v0.24.1
• minimum required Terraform version bumped to 0.13.0
• readme updated, Bridgecrew compliance badges added

why

• It allows for setting the letter case of tag names and labels, back compatibility with context v0.22.0 and below
• we have dropped support for Terraform 0.12
• To be able see and fix the recommendations from Bridgecrew so we can position our modules as standards compliant

closes #31
closes #34