Django 1.8.4 release notes

Bugfixes

• Added a system check warning if the old settings are defined in addition to the new TEMPLATES setting.
• Fixed QuerySet.raw() so InvalidQuery is not raised when using the db_column name of a ForeignKey field with primary_key=True ().
• Fixed has_changed() method in contrib.postgres.forms.HStoreField (#25215, ).
• Fixed the recording of squashed migrations when running the migrate command (#25231).
• Prevented varchar_patterns_ops and text_patterns_ops indexes for ().