Update changelog.

Author: jverswijver

docs-parts/intro/Releases_lang1.rst

@@ -4,6 +4,7 @@
 * Bugfix - Replace use of numpy aliases of built-in types with built-in type. (#938) PR #939
 * Bugfix - `ExternalTable.delete` should not remove row on error (#953) PR #956
 * Bugfix - Fix error handling of remove_object function in `s3.py` (#952) PR #955
+* Bugfix - Fix sql code generation to comply with sql mode ONLY_FULL_GROUP_BY (#916) PR #965
 
 0.13.2 -- May 7, 2021
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