Bump CHANGELOG.md for v4.3.5

Author: Lachlan Donald

CHANGELOG.md

@@ -4,6 +4,23 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## [v4.3.5](https://github.com/buildkite/elastic-ci-stack-for-aws/tree/v4.3.5) (2019-11-01)
+[Full Changelog](https://github.com/buildkite/elastic-ci-stack-for-aws/compare/v4.3.4...v4.3.5)
+
+### Added
+- Prune docker builder cache in cleanup [#642](https://github.com/buildkite/elastic-ci-stack-for-aws/pull/642) (@sj26)
+- Power off immediately if cloud-init fails [#638](https://github.com/buildkite/elastic-ci-stack-for-aws/pull/638) (@dbaggerman)
+- Replaced Linux fixed AMI source with source AMI filter [#636](https://github.com/buildkite/elastic-ci-stack-for-aws/pull/636) (@cawilson)
+- Bump docker version to 19.03.2 [#634](https://github.com/buildkite/elastic-ci-stack-for-aws/pull/634) (@PaulLiang1)
+- Add cloudformation output exports [#616](https://github.com/buildkite/elastic-ci-stack-for-aws/pull/616) (@jradtilbrook)
+- Bump buildkite-agent to v3.13.2 [#605](https://github.com/buildkite/elastic-ci-stack-for-aws/pull/605) (@lox)
+- Add python3 and future lib to allow prepping for Python2 EOL [#583](https://github.com/buildkite/elastic-ci-stack-for-aws/pull/583) (@GreyKn)
+
+### Fixed
+- Add missing eu-north-1 to lambda mapping [#613](https://github.com/buildkite/elastic-ci-stack-for-aws/pull/613) (@lox)
+- Docker experimental needs boolean not string [#611](https://github.com/buildkite/elastic-ci-stack-for-aws/pull/611) (@lox)
+- Update ArtifactBucketPolicy to match docs [#607](https://github.com/buildkite/elastic-ci-stack-for-aws/pull/607) (@gough)
+
 ## [v4.3.4](https://github.com/buildkite/elastic-ci-stack-for-aws/tree/v4.3.4) (2019-07-28)
 [Full Changelog](https://github.com/buildkite/elastic-ci-stack-for-aws/compare/v4.3.3...v4.3.4)