0.18.3 Changelog update (#2245)

Author: achamayou

CHANGELOG.md

@@ -7,8 +7,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [0.18.3]
 
-### Added
+### Changed
 
+- Fixed format of `notBefore` and `notAfter` in node and network certificates (#2243).
 - CCF now depends on [Open Enclave 0.14](https://github.com/openenclave/openenclave/releases/tag/v0.14.0).
 
 ## [0.18.2]
@@ -693,6 +694,8 @@ Some discrepancies with the TR remain, and are being tracked under https://githu
 
 Initial pre-release
 
+[0.18.3]: https://github.com/microsoft/CCF/releases/tag/ccf-0.18.3
+[0.18.2]: https://github.com/microsoft/CCF/releases/tag/ccf-0.18.2
 [0.18.1]: https://github.com/microsoft/CCF/releases/tag/ccf-0.18.1
 [0.18.0]: https://github.com/microsoft/CCF/releases/tag/ccf-0.18.0
 [0.17.2]: https://github.com/microsoft/CCF/releases/tag/ccf-0.17.2