v0.8.0

context.tf & Terraform 0.14 upgrade @Nuru (#31)

what

• Upgrade to use context.tf, support Terraform 0.14, and bring up to current Cloud Posse standard

why

• Support advanced null-label features (some work still to be done)
• Support Terraform 0.14

notes

• The subnets are tagged with a "Name" tag that does not conform to null-label standards. It is left for backwards compatibility.

Closes #21, closes #29, closes #30