• Eventlet 0.21.0 support (#1584)
• Tornado 5 support (#1728, #1752)
• support watching additional files with --reload-extra-file
  (#1527)
• support configuring logging with a dictionary with --logging-config-dict
  (#1087, #1110, #1602)
• add support for the --config flag in the GUNICORN_CMD_ARGS environment
  variable (#1576, #1581)
• disable SO_REUSEPORT by default and add the --reuse-port setting
  (#1553, #1603, #1669)
• fix: installing inotify on MacOS no longer breaks the reloader
  (#1540, #1541)
• fix: do not throw TypeError when SO_REUSEPORT is not available
  (#1501, #1491)
• fix: properly decode HTTP paths containing certain non-ASCII characters
  (#1577, #1578)
• fix: remove whitespace when logging header values under gevent (#1607)
• fix: close unlinked temporary files (#1327, #1428)
• fix: parse --umask=0 correctly (#1622, #1632)
• fix: allow loading applications using relative file paths
  (#1349, #1481)
• fix: force blocking mode on the gevent sockets (#880, #1616)
• fix: preserve leading / in request path (#1512, #1511)
• fix: forbid contradictory secure scheme headers
• fix: handle malformed basic authentication headers in access log
  (#1683, #1684)
• fix: defer handling of USR1 signal to a new greenlet under gevent
  (#1645, #1651)
• fix: the threaded worker would sometimes close the wrong keep-alive
  connection under Python 2 (#1698, #1699)
• fix: re-open log files on USR1 signal using handler._open to
  support subclasses of FileHandler (#1739, #1742)
• deprecation: the gaiohttp worker is deprecated, see the
  worker-class documentation for more information
  (#1338, #1418, #1569)