CHANGELOG.md: update for rc3.

Side note: it's also a birthday, this is not the 0.7 release name :)

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

CHANGELOG.md

@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [0.7.0rc2] - 2019-02-26
+## [0.7.0rc3] - 2019-02-28: "Happy Birthday Alex"
 
 ### Added
 
@@ -309,7 +309,7 @@ There predate the BOLT specifications, and are only of vague historic interest:
 6. [0.5.1] - 2016-10-21
 7. [0.5.2] - 2016-11-21: "Bitcoin Savings & Trust Daily Interest II"
 
-[0.7.0-rc2]: https://github.com/ElementsProject/lightning/compare/v0.6.3...HEAD
+[0.7.0-rc3]: https://github.com/ElementsProject/lightning/compare/v0.6.3...HEAD
 [0.6.3]: https://github.com/ElementsProject/lightning/releases/tag/v0.6.3
 [0.6.2]: https://github.com/ElementsProject/lightning/releases/tag/v0.6.2
 [0.6.1]: https://github.com/ElementsProject/lightning/releases/tag/v0.6.1