Add CHANGELOG.md (#456) (#457)

* Add CHANGELOG.md

CHANGELOG.md

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+# TiDB-Binlog
+All notable changes to this project are documented in this file.
+
+## [2.1.3]
++ Pump
+	- Add a API to get binlog by ts [#449](https://github.com/pingcap/tidb-binlog/pull/449)
+
++ Drainer
+	- Fix history job not sorted by schema version [#444](https://github.com/pingcap/tidb-binlog/pull/444)
+	- Change default config value to more reasonable value [#439](https://github.com/pingcap/tidb-binlog/pull/439) [#442](https://github.com/pingcap/tidb-binlog/pull/442)
+	- Fix not skip rollback state ddl job [#432](https://github.com/pingcap/tidb-binlog/pull/432)
+	- Fix data may not consistent when no pk but has uk [#421](https://github.com/pingcap/tidb-binlog/pull/421)
+
++ Other
+	- Add integration test for node status [#416](https://github.com/pingcap/tidb-binlog/pull/416)
+