docs/releases/1.11.28.txt from django/django

docs/releases/1.11.28.txt

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Django 1.11.28 release notes
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*February 3, 2020*

Django 1.11.28 fixes a security issue in 1.11.27.

CVE-2020-7471: Potential SQL injection via ``StringAgg(delimiter)``
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:class:`~django.contrib.postgres.aggregates.StringAgg` aggregation function was
subject to SQL injection, using a suitably crafted ``delimiter``.