Use version numbers in ChangeLog.md

ChangeLog.md

@@ -2,7 +2,7 @@
 
 This project's release branch is `master`. This log is written from the perspective of the release branch: when changes hit `master`, they are considered released, and the date should reflect that release.
 
-## 2019-03-29
+## v0.1.0.0 - 2019-03-29
 
 * Use reflex-dom's `HydrationDomBuilder` to "hydrate" statically rendered DOM served by the Obelisk backend (rather than re-creating DOM and replacing it all).
 * Add `HasCookies` and `CookiesT` to allow `ObeliskWidget`s to access cookies during static and "hydrated" DOM rendering.