修正 CHANGELOG.md 忘记配置对比链接的小问题

Author: CairoLee

CHANGELOG.md

@@ -1216,6 +1216,7 @@
 
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+[v1.2.0]: https://github.com/PandasWS/Pandas/compare/v1.1.19...v1.2.0
 [v1.1.19]: https://github.com/PandasWS/Pandas/compare/v1.1.18...v1.1.19
 [v1.1.18]: https://github.com/PandasWS/Pandas/compare/v1.1.17...v1.1.18
 [v1.1.17]: https://github.com/PandasWS/Pandas/compare/v1.1.16...v1.1.17