Add release note for #5265

Strict JSON handling

Author: carltongibson

docs/topics/release-notes.md

@@ -52,6 +52,8 @@ You can determine your currently installed version using `pip freeze`:
 
 * Removed DjangoFilterBackend inline with deprecation policy. Use `django_filters.rest_framework.FilterSet` and/or `django_filters.rest_framework.DjangoFilterBackend` instead. [#5273][gh5273]
 * Don't strip microseconds from `time` when encoding. Makes consistent with `datetime`. **BC Change**: Previously only milliseconds were encoded. [#5440][gh5440]
+* Added `STRICT_JSON` setting (default `True`) to raise exception for the extended float values (`nan`, `inf`, `-inf`) accepted by Python's `json` module. **BC Change**: Previously these values would converted to corresponding strings. Set `STRICT_JSON` to `False` to restore the previous behaviour. [#5265][gh5265]
+
 
 
 <!-- 3.7.0 -->
@@ -62,6 +64,7 @@ You can determine your currently installed version using `pip freeze`:
 [djangodocs-set-timezone]: https://docs.djangoproject.com/en/1.11/topics/i18n/timezones/#default-time-zone-and-current-time-zone
 [gh5273]: https://github.com/encode/django-rest-framework/issues/5273
 [gh5440]: https://github.com/encode/django-rest-framework/issues/5440
+[gh5265]: https://github.com/encode/django-rest-framework/issues/5265
 
 
 ## 3.6.x series