Update changelog for v1.0.0-alpha.5

Author: mxmason

CHANGELOG.md

@@ -7,6 +7,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 Prior to v1.0.0-alpha.1, logs were generated by [`auto-changelog`](https://github.com/CookPete/auto-changelog).
 
+## [v1.0.0-alpha.5](https://github.com/netlify-labs/netlify-plugin-a11y/compare/v1.0.0-alpha.4...v1.0.0-alpha.5)
+
+### Added
+- New input: `ignoreElements`. Used to indicate to the test runner elements which should be ignored during a11y testing.
+### Changed
+- Lowers minimum required version of Node from `12.13.0` to `12.0.0`.
+- Internal: Uses a local server powered by the Node `http` module to host files prior to testing. This local server makes tests more accurate and more secure!
 ## [v1.0.0-alpha.4](https://github.com/netlify-labs/netlify-plugin-a11y/compare/v1.0.0-alpha.3...v1.0.0-alpha.4)
 ### Changed
 - Added a pre-release notice to the README, as well as other copy cleanup.