[ci skip] Mark the start of 3.1.3-dev

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+#############################
+Upgrading from 3.1.2 to 3.1.3
+#############################
+
+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.