Day 3: Newer terraform versions need module outputs specified in the root terraform file

[sam112eer]

Newer terraform versions do not support module output files explicitly.
see: hashicorp/terraform#22126

Therefore, adding these lines to root main.tf fixes the output visibility issue

add to root main.tf

output "ec2_instance_public_ip" { value = module.ec2_instance.public-ip-address }