update changelog for upcoming release (#1175)

CHANGELOG.adoc

@@ -15,6 +15,13 @@
 
 https://github.com/oxidecomputer/dropshot/compare/v0.12.0\...HEAD[Full list of commits]
 
+=== Breaking Changes
+
+* Dropshot now expects that APIs use https://semver.org/[Semver] values for their version string.  Concretely, this only means that the `version` argument to `ApiDescription::openapi` (which generates an OpenAPI document) must be a `semver::Version`.  Previously, it was `AsRef<str>`.
+* If you're invoking `ApiEndpoint::new` directly or constructing one as a literal (both of which are uncommon), you must provide a new `ApiEndpointVersions` value describing which versions this endpoint implements.  You can use `ApiEndpointVersions::All` if you don't care about versioning.
+
+=== Other notable changes
+
 * https://github.com/oxidecomputer/dropshot/pull/1122[#1122] Adds a new `ServerBuilder` as the primary way of constructing a Dropshot server.  This replaces `HttpServerStarter::new()` and `HttpServerStarter::new_with_tls()`.  These older functions still exist for compatibility.  They may be removed in an upcoming release, along with the `HttpServerStarter`.
 +
 In this release, using the builder interface is not very different from using these older functions.  But as we look at adding new construction-time options (e.g., for API versioning), those will only be added to the builder.
@@ -67,12 +74,6 @@ We'd like to remove the `HttpServerStarter` altogether, so let us know if you're
 +
 By "experimental" we only mean that the API may change in upcoming releases.
 
-=== Breaking Changes
-
-* Dropshot now expects that APIs use https://semver.org/[Semver] values for their version string.  Concretely, this only means that the `version` argument to `ApiDescription::openapi` (which generates an OpenAPI document) must be a `semver::Version`.  Previously, it was `AsRef<str>`.
-* If you're invoking `ApiEndpoint::new` directly or constructing one as a literal (both of which are uncommon), you must provide a new `ApiEndpointVersions` value describing which versions this endpoint implements.  You can use `ApiEndpointVersions::All` if you don't care about versioning.
-
-
 == 0.12.0 (released 2024-09-26)
 
 https://github.com/oxidecomputer/dropshot/compare/v0.11.0\...v0.12.0[Full list of commits]