Added changelog entry.

CHANGELOG.rst

@@ -18,18 +18,21 @@ number of the code change for that issue.  These PRs can be viewed at:
     https://github.com/spacetelescope/drizzlepac/pulls
 
 
-3.8.0 (unreleased)
-==================
+3.9.0 (16-Dec-2024)
+===================
+
+- **This version used by operations but does not generate HAP products (SVM/MVM).**
+
 - Include a minimum RMS value for the SBC detector, as is done for the other
-  detectors, as there seems to be a lot of noise in the source catalogs due to 
+  detectors, as there seems to be a lot of noise in the source catalogs due to
   a low detection threshold. [#1908]
 
 - Force an exit with a return code, KEYWORD_UPDATE_PROBLEM, in try/exception block
   when invoking refine_product_headers in hapsequencer.py and hapmultisequencer.py.
   If the FITS header keywords are not properly updated, this can cause errors during
   CAOM ingest. [#1911]
 
-- Introduce warnings for fits extensions with science data of all zeros, and ensure 
+- Introduce warnings for fits extensions with science data of all zeros, and ensure
   data with zeros in all science extensions are not processed. [#998]
 
 - Change to the algorithm which chooses which background determination algorithm to
@@ -61,10 +64,16 @@ number of the code change for that issue.  These PRs can be viewed at:
   defined by full paths rather than being in the current working directory. [#1835]
 
 
+3.8.0
+=====
+
+- Version not released; internal testing only.
+
+
 3.7.1.1 (1-Oct-2024)
 ====================
 
-- Improved S_REGION using simplify-polygon, eorions, and dilation. [#1323] 
+- Improved S_REGION using simplify-polygon, eorions, and dilation. [#1323]
 
 
 3.7.1 (12-Aug-2024)