Add a CHANGES document

CHANGES.md

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+## Version 0.4.0
+
+> 2016 April 29
+
+New features:
+
+ * adds `Table` to try and simplify common use cases [#21](https://github.com/guardian/scanamo/pull/21)
+ * adds support for queries that return results in descending range key order [#23](https://github.com/guardian/scanamo/pull/23)
+ * adds default `DynamoFormat` instances for `Double`, `Set[Int]`, `Set[Long]`, `Set[Double]` and `Set[String]` [#24](https://github.com/guardian/scanamo/pull/24)
+ * adds `coercedXmap` to `DynamoFormat` for the common case of serialisation that should always work, 
+ but deserialisation that is only valid for a subset of the serialised type [#14](https://github.com/guardian/scanamo/pull/14)
+
+Breaking changes:
+
+ * replaces `cats.data.Streaming` with `collection.immutable.Stream` [#13](https://github.com/guardian/scanamo/pull/13)
+ * replaces `cats.data.ValidatedNel` with `cats.data.Xor` in public interface 
+ [#15](https://github.com/guardian/scanamo/pull/15) and [#16](https://github.com/guardian/scanamo/pull/16)
+ * moves the packages that a number of types live in [#17](https://github.com/guardian/scanamo/pull/17)