Update release notes

Signed-off-by: Roberto Rosario <roberto.rosario@mayan-edms.com>

HISTORY.rst

@@ -1,4 +1,4 @@
-3.3.4 (2019-12-XX)
+3.3.4 (2019-12-09)
 ==================
 - Update the gunicorn worker class to synchronous.
 - Update the way the BaseTransformationType metaclass is passed

docs/releases/3.3.4.txt

@@ -1,13 +1,80 @@
 Version 3.3.4
 =============
 
-Released: December XX, 2019
+Released: December 09, 2019
 
 
 Changes
 -------
 
 
+Celery
+^^^^^^
+
+Switched from ``librabbitmq`` to ``py-amqp``. This library is used to connect
+to RabbitMQ and be used as the message broker for the background tasks.
+Although the official documentation still lists ``librabbitmq``, maintainers
+are recommending users to move to ``py-amqp``.
+
+
+Converter
+^^^^^^^^^
+
+Fixed the label display of the transformations. The way the
+BaseTransformationType metaclass is passed was updated to work on Python 3.
+
+
+Development
+^^^^^^^^^^^
+
+Updated devpi-server version to 5.3.1.
+
+Added targets to run staging containers using RabbitMQ as broker.
+
+Fix docker-runtest-all makefile target.
+
+
+Frontend
+^^^^^^^^
+
+Changed the ``gunicorn`` worker class to synchronous. This change was made in
+the Docker image and is now the worker class for the direct deployment too.
+Update the ``supervisord`` config file to activate this change. This solves
+spurious HTTP timeout errors caused by Celery's new Redis interface not
+working with threaded serverlets.
+
+
+File metadata
+^^^^^^^^^^^^^
+
+Add locking to the file metadata document processing task.
+
+
+Settings
+^^^^^^^^
+
+The setting override colums was changed from text to a check mark widget.
+This makes it clear when a setting is being overridden by an environment
+variable.
+
+Added icons to the smart settings links.
+
+Fixed the evaluation priority of the bootstrap settings. This issue was
+causing environment variables to be ignored in favor of config file values on
+Docker images.
+
+
+User interface
+^^^^^^^^^^^^^^
+
+Darken content area when opening the mobile menu.
+
+
+Other
+^^^^^
+
+Don't set SourceColumn to the attribute name when no help text is defined.
+
 
 Removals
 --------
@@ -90,7 +157,7 @@ Upgrade steps from any previous version of Mayan EDMS
 
    .. code-block:: bash
 
-    sudo -u mayan |MAYAN_PIP_BIN| install mayan-edms==3.3.3
+    sudo -u mayan |MAYAN_PIP_BIN| install mayan-edms==3.3.4
 
    the requirements will also be updated automatically.