Update CHANGELOG links, add entries for v0.5.0

This commit updates the CHANGELOG.md to include links for versions,
links for pull request entries, separates additions and changes for
the unreleased version, catches up pull request
of 2019-02-28.

Author: adrienthebo

CHANGELOG.md

@@ -1,44 +1,90 @@
 # Change Log
-
 All notable changes to this project will be documented in this file.
 
-The format is based on [Keep a Changelog](http://keepachangelog.com/) and this
-project adheres to [Semantic Versioning](http://semver.org/).
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+Extending the adopted spec, each change should have a link to its corresponding pull request appended.
 
 ## [Unreleased]
+
+## [v0.5.0] - 2019-02-28
+### Added
+* Allow creation of service accounts. [#80]
+* Add support for private clusters via submodule. [#69]
+* Add `remove_default_node_pool` set to `false` by default. Fixes [#15]. [#55]
+* Allow arbitrary key-value pairs to be set on node pool metadata. [#52]
+* Add `initial_node_count` parameter to node_pool block. [#60]
+
 ### Changed
-* Add support for private clusters via submodule. #69
-* Set `horizontal_pod_autoscaling` to `true` by default. #42
-* Add `remove_default_node_pool` set to `false` by default #15
-* Allow arbitrary key-value pairs to be set on node pool metadata. #52
-* Add `initial_node_count` parameter to node_pool block. #60
+* Set `horizontal_pod_autoscaling` to `true` by default. Fixes [#42]. [#54]
+* Update simple-zonal example GKE version to supported version. [#49]
+* Remove explicit versions from test cases and examples. [#62]
+* Set up submodule structure for public and private clusters. [#61]
+
+### Fixed
+* Zonal clusters can now accept a single zone. Fixes [#43]. [#50]
+* Drop explicit version from simple_zonal example. [#74]
+* Fix link to "configure a service account" [#73]
 
 ## [v0.4.0] - 2018-12-19
 ### Added
-* Added support for testing with kitchen-terraform. #33
-* Added support for preemptible nodes. #38
+* Added support for testing with kitchen-terraform. [#33]
+* Added support for preemptible nodes. [#38]
 
 ### Changed
-* Updated default version to `1.10.6`. #31
+* Updated default version to `1.10.6`. [#31]
 
 ### Fixed
-* `region` argument on google_compute_subnetwork caused errors. #22
-* Added check to wait for GKE cluster to be `READY` before completing. #46
+* `region` argument on google_compute_subnetwork caused errors. [#22]
+* Added check to wait for GKE cluster to be `READY` before completing. [#46]
 
 ## [v0.3.0] - 2018-10-10
 ### Changed
-* Updated network/subnetwork lookup to use data source. #16
-* Make zone configuration optional when creating a regional cluster. #19
+* Updated network/subnetwork lookup to use data source. [#16]
+* Make zone configuration optional when creating a regional cluster. [#19]
 
 ## [v0.2.0] - 2018-09-26
 
 ### Added
 
-* Support for configuring master authorized networks. (#10)
-* Support specifying monitoring and logging services. (#9)
+* Support for configuring master authorized networks. [#10]
+* Support specifying monitoring and logging services. [#9]
 
-## [v0.1.0] - 2018-09-12
+## v0.1.0 - 2018-09-12
 
 ### Added
 
 * Initial release of module.
+
+[Unreleased]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/compare/v0.5.0...HEAD
+[v0.4.0]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/compare/v0.4.0...v0.5.0
+[v0.4.0]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/compare/v0.3.0...v0.4.0
+[v0.3.0]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/compare/v0.2.0...v0.3.0
+[v0.2.0]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/compare/v0.1.0...v0.2.0
+
+[#43]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/issues/43
+[#42]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/issues/42
+[#15]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/issues/15
+
+[#80]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/pull/80
+[#74]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/pull/74
+[#73]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/pull/73
+[#61]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/pull/61
+[#69]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/pull/69
+[#62]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/pull/62
+[#60]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/pull/60
+[#54]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/pull/54
+[#52]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/pull/52
+[#50]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/pull/50
+[#49]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/pull/49
+[#46]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/pull/46
+[#38]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/pull/38
+[#33]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/pull/33
+[#31]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/pull/31
+[#22]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/pull/22
+[#19]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/pull/19
+[#16]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/pull/16
+[#15]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/pull/15
+[#10]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/pull/10
+[#9]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/pull/9