Add note about the new preparestatic command

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

HISTORY.rst

@@ -275,6 +275,7 @@
 * Remove repeated EMAIL_TIMEOUT setting.
 * Invert order to the Action Object and Target columns for
   clarity.
+* Add note about the new preparestatic command.
 
 3.1.11 (2019-04-XX)
 ===================

docs/releases/3.2.rst

@@ -781,7 +781,7 @@ Migrate existing database schema with::
 
 Add new static media::
 
-    $ mayan-edms.py collectstatic --noinput
+    $ mayan-edms.py preparestatic --noinput
 
 The upgrade procedure is now complete.
 
@@ -835,6 +835,11 @@ Backward incompatible changes
   way, but ``preparestatic`` has a default backlist to avoid collecting
   test files.
 
+- Instead of the ``collectstatic``, the new ``preparestatic`` command should be
+  used. ``preparestatic`` is a wrapper for ``collectstatic`` that includes
+  a pattern list of files that are not to be collected for production. Files
+  from tests, development setup, demos are ignored using this command.
+
 Bugs fixed or issues closed
 ---------------------------