Create next branch for breaking changes (0.4.0-dev)

- Bump version to 0.4.0-dev
- Add Breaking section to CHANGELOG above Unreleased

CHANGELOG.md

@@ -5,6 +5,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Breaking
+
+_Wire-format and API breaking changes for the next major release._
+
 ## [Unreleased]
 
 ### Added

Cargo.lock

@@ -953,7 +953,7 @@ checksum = "9844ddc3a6e533d62bba727eb6c28b5d360921d5175e9ff0f1e621a5c590a4d5"
 
 [[package]]
 name = "fips"
-version = "0.3.0-dev"
+version = "0.4.0-dev"
 dependencies = [
  "bech32",
  "bluer",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "fips"
-version = "0.3.0-dev"
+version = "0.4.0-dev"
 edition = "2024"
 description = "A distributed, decentralized network routing protocol for mesh nodes connecting over arbitrary transports"
 license = "MIT"