Update changelog for v2.4.0

Author: JonasAlfredsson

docs/changelog.md

@@ -1,5 +1,15 @@
 # Changelog
 
+### 2.4.0
+- Create a script that can sign certificates with the help of a
+  [local certificate authortiy](./advanced_usage#local-ca).
+  - It is now possible to work completely offline.
+  - We can now create certificates for `localhost`.
+- Restructure and add a lot of documentation.
+- `openssl` is now a symlink to `libressl` in the Alpine images.
+  - This is done to simplify the rest of the scripts since the arguments are
+    the same.
+
 ### 2.3.0
 - Add support for [ECDSA][27] certificates.
   - It is possible to have Nginx serve both ECDSA and RSA certificates at the

docs/dockerhub_tags.md

@@ -17,7 +17,8 @@ are updated.
 
 | Major | Minor | Patch | Nginx              |
 | ----: | ----: | ----: | :----------------- |
-| 2     | 2.3   | 2.3.0 | 2.3.0-nginx1.21.0  |
+| 2     | 2.4   | 2.4.0 | 2.4.0-nginx1.21.0  |
+|       | 2.3   | 2.3.0 | 2.3.0-nginx1.21.0  |
 |       | 2.2   | 2.2.0 | 2.2.0-nginx1.21.0  |
 |       |       |       | 2.2.0-nginx1.19.10 |
 |       | 2.1   | 2.1.0 | 2.1.0-nginx1.19.10 |