Update TravisCI config and comments

Author: rf-sys

.travis.yml

@@ -9,8 +9,8 @@ cache: bundler
 
 before_install:
   - sudo apt-get install wget unzip
-  - wget https://releases.hashicorp.com/terraform/0.11.5/terraform_0.11.5_linux_amd64.zip
-  - unzip terraform_0.11.5_linux_amd64.zip -d ~/bin
+  - wget https://releases.hashicorp.com/terraform/0.11.7/terraform_0.11.7_linux_amd64.zip
+  - unzip terraform_0.11.7_linux_amd64.zip -d ~/bin
   - source ~/.profile
 
 install:

variables.tf

@@ -7,7 +7,7 @@ variable "aws_region" {}
 # instance
 
 variable "aws_instance_ami" {
-  # Default CentOS AMI. Last check: 03.04.2018
+  # Default CentOS AMI. Last check: 02.08.2018
   default = "ami-dd3c0f36"
 }
 variable "aws_instance_type" {}