Remove 2020 unreleased changelog

docs/source/2020-news.rst

@@ -5,50 +5,3 @@ Changelog - 2020
 .. note::
 
    Please see :doc:`news` for the latest changes
-
-Unreleased
-==========
-
-- document WEB_CONCURRENCY is set by, at least, Heroku
-- capture peername from accept: Avoid calls to getpeername by capturing the peer name returned by
-accept
-- log a warning when a worker was terminated due to a signal
-- fix tornado usage with latest versions of Django 
-- add support for python -m gunicorn
-- fix systemd socket activation example
-- allows to set wsgi application in configg file using `wsgi_app`
-- document `--timeout = 0`
-- always close a connection when the number of requests exceeds the max requests
-- Disable keepalive during graceful shutdown
-- kill tasks in the gthread workers during upgrade
-- fix latency in gevent worker when accepting new requests
-- fix file watcher: handle errors when new worker reboot and ensure the list of files is kept
-- document the default name and path of the configuration file
-- document how variable impact configuration
-- document the `$PORT` environment variable
-- added milliseconds option to request_time in access_log
-- added PIP requirements to be used for example
-- remove version from the Server header
-- fix sendfile: use `socket.sendfile` instead of `os.sendfile`
-- reloader: use  absolute path to prevent empty to prevent0 `InotifyError` when a file 
-  is added to the working directory
-- Add --print-config option to print the resolved settings at startup.
-- remove the `--log-dict-config` CLI flag because it never had a working format
-  (the `logconfig_dict` setting in configuration files continues to work)
-
-
-** Breaking changes **
-
-- minimum version is Python 3.5
-- remove version from the Server header 
-
-** Documentation **
-
-
-
-** Others **
-
-- miscellaneous changes in the code base to be a better citizen with Python 3
-- remove dead code
-- fix documentation generation
-