Merge pull request #26 from tomhoule/interfaces

Create CHANGELOG.md

Author: tomhoule

CHANGELOG.md

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+# Changelog
+
+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).
+
+## Unreleased
+
+### Added
+
+- Support generating a `Variables` struct for a given query and schema through a custom derive, corresponding to the expected variables.
+- Support generating a `ResponseData` struct for a given query and schema through a custom derive, corresponding to the shape of the expected response.
+- Various utility traits and structs for working with GraphQL query. This notably does not include code to actually perform the network operations. This may be part of future releases.