docs: Bump API version in docs to 1.4

Signed-off-by: Stephen Finucane <stephen@that.guru>

Author: stephenfin

docs/api/rest/index.rst

@@ -43,6 +43,11 @@ If all you want is reference guides, skip straight to :ref:`rest-api-schemas`.
    The API version was bumped to v1.3 in Patchwork v3.1. The older APIs are
    still supported. For more information, refer to :ref:`rest-api-versions`.
 
+.. versionchanged:: 3.3
+
+   The API version was bumped to v1.4 in Patchwork v3.3. The older APIs are
+   still supported. For more information, refer to :ref:`rest-api-versions`.
+
 Getting Started
 ---------------
 
@@ -79,7 +84,7 @@ well-supported. To repeat the above example using `requests`:, run
     $ python
     >>> import json
     >>> import requests
-    >>> r = requests.get('https://patchwork.example.com/api/1.3/')
+    >>> r = requests.get('https://patchwork.example.com/api/1.4/')
     >>> print(json.dumps(r.json(), indent=2))
     {
         "bundles": "https://patchwork.example.com/api/1.4/bundles/",
@@ -275,7 +280,7 @@ Supported Versions
    1.1, 2.1, ✓
    1.2, 2.2, ✓
    1.3, 3.1, ✓
-   1.4, unreleased, ✓
+   1.4, 3.3, ✓
 
 Further information about this and more can typically be found in
 :doc:`the release notes </releases/index>`.