Dropped support for PostgreSQL 9.0.

docs/ref/contrib/gis/install/index.txt

@@ -58,7 +58,7 @@ supported versions, and any notes for each of the supported database backends:
 ==================  ==============================  ==================  =========================================
 Database            Library Requirements            Supported Versions  Notes
 ==================  ==============================  ==================  =========================================
-PostgreSQL          GEOS, PROJ.4, PostGIS           9.0+                Requires PostGIS.
+PostgreSQL          GEOS, PROJ.4, PostGIS           9.1+                Requires PostGIS.
 MySQL               GEOS                            5.5+                Not OGC-compliant; :ref:`limited functionality <mysql-spatial-limitations>`.
 Oracle              GEOS                            11.1+               XE not supported.
 SQLite              GEOS, GDAL, PROJ.4, SpatiaLite  3.6.+               Requires SpatiaLite 2.3+, pysqlite2 2.5+

docs/ref/databases.txt

@@ -92,7 +92,7 @@ below for information on how to set up your database correctly.
 PostgreSQL notes
 ================
 
-Django supports PostgreSQL 9.0 and higher. It requires the use of `psycopg2`_
+Django supports PostgreSQL 9.1 and higher. It requires the use of `psycopg2`_
 2.4.5 or higher (or 2.5+ if you want to use :mod:`django.contrib.postgres`).
 
 .. _psycopg2: http://initd.org/psycopg/

docs/releases/1.9.txt

@@ -299,6 +299,12 @@ no longer include the scheme and domain part of the URLs. For example,
 replaced by ``self.assertRedirects(response, '/some-url/')`` (unless the
 redirection specifically contained an absolute URL, of course).
 
+Dropped support for PostgreSQL 9.0
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Upstream support for PostgreSQL 9.0 ended in September 2015. As a consequence,
+Django 1.9 sets 9.1 as the minimum PostgreSQL version it officially supports.
+
 Miscellaneous
 ~~~~~~~~~~~~~