Merge pull request #98 from cryptape/hotfix_change-log

doc: add CHANGELOG for 0.20.3

Author: BaojunCZ

CHANGELOG.md

@@ -0,0 +1,7 @@
+All notable changes to this project will be documented in this file.
+
+# [v0.20.3](https://github.com/cryptape/cita-sdk-swift/compare/v0.20...v0.20.3) (2019-01-21)
+
+### BREAKING CHANGES
+
+* Rename the project to `cita-sdk-java`. Change top module from `AppChain` to `CITA`.