Cosmetic fixes (#131)

* changing syntax when referring to map keys without lookup function

* Replacing map function with actual maps for easier reading

* replacing map function in example

* replacing map function in workers.tf and readme/main

* update changelog

README.md

@@ -26,7 +26,7 @@ module "eks" {
   source                = "terraform-aws-modules/eks/aws"
   cluster_name          = "test-eks-cluster"
   subnets               = ["subnet-abcde012", "subnet-bcde012a"]
-  tags                  = "${map("Environment", "test")}"
+  tags                  = {Environment = "test"}
   vpc_id                = "vpc-abcde012"
 }
 ```