Add changelog

Josh Price · Josh Price · commit 596767fdec6d · 2016-03-19T13:06:53.000+11:00
diff --git a/CHANGELOG.md b/CHANGELOG.md
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+# Changelog
+
+## 0.2.0 (2016-03-19)
+
+* Enhancements
+  * Interface, Union and Input type support
+  * Types can be referenced in schemas using modules or atoms
+  * Require Elixir 1.2 and above
+
+* Bugfixes
+  * Resolve now accepts a map with string keys
+  * Duplicate field definitions handled correctly (required for Relay support)
