DOC: adding changelog [skip ci]

Author: bsipocz

CHANGES.rst

@@ -205,7 +205,7 @@ mast
 - Present users with an error rather than a warning when nonexistent query criteria are used in ``mast.Observations.query_criteria``
   and ``mast.Catalogs.query_criteria``. [#3084]
 
-- Support for case-insensitive criteria keyword arguments in ``mast.Observations.query_criteria`` and 
+- Support for case-insensitive criteria keyword arguments in ``mast.Observations.query_criteria`` and
   ``mast.Catalogs.query_criteria``. [#3087]
 
 - Added function ``mast.Observations.get_unique_product_list`` to return the unique data products associated with
@@ -802,6 +802,8 @@ esa.esasky
 
 - Added Solar System Object functionality. [#2106]
 
+- Added support for eROSITA downloads. [#3111]
+
 ipac
 ^^^^