Deprecate using Terraform versions before 1.0

Module now requires using Terraform version 1.0 or higher.

Adds the ability to specify ephemeral storage for the lambda

Merge pull request #27 from trussworks/add-dynamic-ephemeral-storage

adds ephemeral storage variable

Add option to publish new Lambda function version

Add the option to publish creation/change as a new Lambda Function Version: https://docs.aws.amazon.com/lambda/latest/dg/configuration-versions.html.

Update interpolation syntax

Use the new interpolation syntax documented here: https://www.terraform.io/upgrade-guides/0-12.html#first-class-expressions

Relax Terraform compatible versioning & Repo Updates

This release focuses on:

• Updating CircleCI image
• Precommit plugins
• Upgrade TF providers
• Allow for TF 0.14
• Cleanup circleci yaml

Fix Dependency Issues

Related PR #18

New version compatibility

Merge pull request #17 from trussworks/ee-update-versions-strings

updating version string for compatibility

GovCloud Partition Compatibility

Minor update to handle GovCloud partitions.

Adds variable handler

var.handler is now the explicit definition of the entrypoint function of the lambda.

Pin TF12

Merge pull request #12 from trussworks/cg_pin

Pin tf version to 0.12 family. Update pre-commit.