Update Changelog.

Author: dadish

Changelog.md

@@ -1,6 +1,21 @@
 ProcessGraphQL Changelog
 ========================
 
+### 0.17.0
+This release introduces lots of changes to repository structure and development
+process.
+- The master branch no longer tracks the vendor directory. This means that it
+is not suitable as a ProcessWire module. Instead you need to use [latest release][latest-release]
+tags as a ProcessWire module. Release branches are a minified version of this
+module that includes everything needed and works out of the box. The master
+branch is used for development.
+- Now we have a Continious Integration implemented. ![Build Status][travis-ci-badge]
+This means that people can contribute confidently by running test suite and
+be sure that nothing has broken and a pull-request will be merged.
+- `$ProcessGraphQL->executeGraphQL` now accepts `payload` & `variables` as an
+argument. This allows you to modify the payload from client and manually pass
+it to the module to meet your needs.
+
 ### 0.16.0
 - Add support for getQuery & getMutation hooks.
 
@@ -94,4 +109,6 @@ ProcessGraphQL Changelog
 - Added a Changelog file!
 
 
-[module-access-control]: https://github.com/dadish/ProcessGraphQL/tree/master#access-control
+[module-access-control]: https://github.com/dadish/ProcessGraphQL/tree/master#access-control
+[latest-release]: https://github.com/dadish/ProcessGraphQL/releases/latest
+[travis-ci-badge]: https://www.travis-ci.org/dadish/ProcessGraphQL.svg?branch=master