v0.19.0

Enable intra-security group traffic on DB port @kevcube (#61)

what

• adds variable allow_ingress_from_self which configures the security group to allow traffic within itself on DB port

why

• This is useful in architectures where the db security group will be used to control db access - i.e. it will also be applied to applications.

references

cloudposse/terraform-aws-rds-cluster#145