Prepare for 3.1.0 release

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+#############################
+Upgrading from 3.0.6 to 3.1.0
+#############################
+
+Before performing an update you should take your site offline by
+replacing the index.php file with a static one.
+
+Step 1: Update your CodeIgniter files
+=====================================
+
+Replace all files and directories in your *system/* directory.
+
+.. note:: If you have any custom developed files in these directories,
+	please make copies of them first.
+
+Step 2: If you're using the 'odbc' database driver, check for usage of Query Builder
+====================================================================================
+
+:doc:`Query Builder <../database/query_builder>` functionality and ``escape()`` can
+no longer be used with the 'odbc' database driver.
+
+This is because, due to its nature, the `ODBC extension for PHP <https://secure.php.net/odbc>`_
+does not provide a function that allows to safely escape user-supplied strings for usage
+inside an SQL query (which our :doc:`Query Builder <database/query_builder>` relies on).
+
+Thus, user inputs MUST be bound, as shown in :doc:`Running Queries <../database/queries>`,
+under the "Query Bindings" section.
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