Update CHANGELOG

Author: jmhale

CHANGELOG.md

@@ -1,6 +1,25 @@
 # Changelog
 All notable changes to this project will be documented in this file.
 
+## [1.0.0] - 2019-10-13
+Note that this release contains breaking changes. Hence the major version bump.
+
+### Added
+- Support for TF v0.12
+- Support for Network Load Balancers
+- Variable `instance_type` added.
+- Variable `additional_security_group_ids` added to support more flexibility with security groups.
+- Variable `eip_id` added to pass in an EIP object
+- `asg_min_size`, `asg_max_size`, and `asg_desired_capacity` variables for autoscaling groups.
+- Variable `wg_persistent_keepalive` to set keepalive in seconds. Set to 0 to disable.
+
+### Changed
+- Variable `public_subnet_ids` renamed to `subnet_ids`
+- Ubuntu AMI used will now default to the latest.
+
+### Removed
+- An EIP is no longer created in this module, in order to support the option to use a ELB. Instead, a EIP ID must be passed in, if that is the desired configuration.
+
 ## [0.0.2] - 2019-03-02
 ### Added
 - Multi-client support via the module variable.