Update CHANGELOG

CHANGELOG.md

@@ -7,8 +7,18 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 Generated by [`auto-changelog`](https://github.com/CookPete/auto-changelog).
 
 ## [Unreleased](https://github.com/netlify/build-image/compare/v2.2.1...HEAD)
+### Merged
+- Add python3.5-dev and python3.6-dev packages [`#155`](https://github.com/netlify/build-image/pull/155)
+- Better error on python fail [`#153`](https://github.com/netlify/build-image/pull/153)
+- Add version list to README [`#152`](https://github.com/netlify/build-image/pull/152)
+
+### Fixed
+- Add python3.5-dev and python3.6-dev packages [`#154`](https://github.com/netlify/build-image/issues/154)
+
 ### Commits
-- Fail build if python version is not available [`7946cfd`](https://github.com/netlify/build-image/commit/7946cfd8a4d07a25ce47bc20fccbd5d3d3c19fdc)
+- Fail build if python version is not available [`cad6eea`](https://github.com/netlify/build-image/commit/cad6eeaa83b381c5e1f325ad4b99267e678a4c52)
+- update error messaging with pointer to current versions [`49d9437`](https://github.com/netlify/build-image/commit/49d9437d12c9e4c4d55ae390012c20f4df6dfb98)
+- update messaging [`fe344a4`](https://github.com/netlify/build-image/commit/fe344a4eb68ee1448d66683faa95ab4be231b37e)
 
 ## [v2.2.1](https://github.com/netlify/build-image/compare/v2.2.0...v2.2.1) - 2018-02-23
 ### Fixed