Update changes.rst for v1.7.9
closes - Add improved support for working with Google Sheets and
closes - Improve test helpers testing
Changes
=======
+Version 1.7.9
+-------------
+
+* Feature: Add improved support for working with Google Sheets
+ By :user:`juarezr`, :issue:`615`.
+
+* Maintanance: Improve test helpers testing
+ By :user:`juarezr`, :issue:`614`.
+
Version 1.7.8
-------------
