chore: prep v4.0.0 (#356)

Signed-off-by: Jan Kowalleck <[email protected]>

Author: jkowalleck

HISTORY.md

@@ -2,7 +2,7 @@
 
 All notable changes to this project will be documented in this file.
 
-## 4.0.0 - unreleased
+## 4.0.0 - 2023-03-31
 
 Based on [OWASP Software Component Verification Standard for Software Bill of Materials](https://scvs.owasp.org/scvs/v2-software-bill-of-materials/)
 (SCVS SBOM) criteria, this tool is now capable of producing SBOM documents almost passing Level-2 (only signing needs to be done externally).  

README.md

@@ -20,13 +20,6 @@ The resulting SBOM documents follow [official specifications and standards](http
 and might have properties following [`cdx:composer` Namespace Taxonomy](https://github.com/CycloneDX/cyclonedx-property-taxonomy/blob/main/cdx/composer.md)
 .
 
-## !! ATTENTION - v4-dev state
-
-The branch "master" is currently in the transition to next major version: v4.
-See the progress in the [milestone "v4"](https://github.com/CycloneDX/cyclonedx-php-composer/milestone/5)
-
-Code of v3 is in branch "[3.x](https://github.com/CycloneDX/cyclonedx-php-composer/tree/3.x)"
-
 ## Requirements
 
 * PHP `^8.1`

docs/dev/processes/major_version_switch.md

@@ -8,7 +8,8 @@ when a MAJOR release `n+1.0.0` is planned or happens:
    to `n+1.x-dev`
    on `master` branch.
 1. Create a branch `n.x` from `master`.
-1. Remove the `extra.branch-alias`
+1. Optional:
+   Remove the `extra.branch-alias`
    in [`composer.json`](../../../composer.json)
    on `n.x` branch.
 1. Add branch `n.x` to "branch protection"

semver.txt

@@ -1 +1 @@
-4.0.0-RC2
+4.0.0