Update changelog for v5.1.0

Author: JonasAlfredsson

docs/changelog.md

@@ -1,5 +1,10 @@
 # Changelog
 
+### 5.1.0
+- Add ability to change validity time of the local CA.
+  - This variable is not mentioned in the main README since it should not be
+    used without reading the relevant advanced documentation.
+
 ### 5.0.1
 - Lock certbot version via a `requirements.txt` file.
   - Updates to the certbot version will now bump patch version of this repo.

docs/dockerhub_tags.md

@@ -17,7 +17,8 @@ are updated.
 
 | Major | Minor | Patch | Nginx              |
 | ----: | ----: | ----: | :----------------- |
-| 5     | 5.0   | 5.0.1 | 5.0.1-nginx1.25.4  |
+| 5     | 5.1   | 5.1.0 | 5.1.0-nginx1.25.4  |
+|       | 5.0   | 5.0.1 | 5.0.1-nginx1.25.4  |
 |       |       |       | 5.0.1-nginx1.25.3  |
 |       |       | 5.0.0 | 5.0.0-nginx1.25.3  |
 |       |       |       | 5.0.0-nginx1.25.2  |