Add a CHANGELOG

Author: geowarin

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [Unreleased]
+
+Update to the new history API (#89)
+
+## [1.0.0] - 2015-12-07
+
+### Breaking
+
+The `updatePath(path, noRouterUpdate)` action creator has been removed in favor of
+`pushPath(path, state, avoidRouterUpdate)` and `replacePath(path, state, avoidRouterUpdate)`