Log Message:
mitmproxy: Update net/mitmproxy to 4.0.1

pkgsrc changes:
 - Take MAINTAINERship
 - Sync DEPENDS with setup.py
 - Add Python 3.5 to PYTHON_VERSIONS_INCOMPATIBLE (mitmproxy now requires Python
   3.6)

Changes:
mitmproxy 4.0.1
---------------
The previous release had a packaging issue, so we bumped it to
v4.0.1 and re-released it. This contains no actual bugfixes or
new features.

mitmproxy 4.0
-------------
Features
--------
 * mitmproxy now requires Python 3.6!
 * Moved the core to asyncio - which gives us a very significant performance
   boost!
 * Reduce memory consumption by using `SO_KEEPALIVE` (#3076)
 * Export request as httpie command (#3031)
 * Configure mitmproxy console keybindings with the keys.yaml file. See docs
   for more.

Breaking Changes
----------------
 * The --conf command-line flag is now --confdir, and specifies the mitmproxy
   configuration directory, instead of the options yaml file (which is at
   `config.yaml` under the configuration directory).
 * `allow_remote` got replaced by `block_global` and `block_private` (#3100)
 * No more custom events (#3093)
 * The `cadir` option has been renamed to `confdir`
 * We no longer magically capture print statements in addons and translate
   them to logs. Please use `ctx.log.info` explicitly.

Bugfixes
--------
 * Correctly block connections from remote clients with IPv4-mapped IPv6
   client addresses (#3099)
 * Expand `~` in paths during the `cut` command (#3078)
 * Remove socket listen backlog constraint
 * Improve handling of user script exceptions (#3050, #2837)
 * Ignore signal errors on windows
 * Fix traceback for commands with un-terminated escape characters (#2810)
 * Fix request replay when proxy is bound to local interface (#2647)
 * Fix traceback when running scripts on a flow twice (#2838)
 * Fix traceback when killing intercepted flow (#2879)
 * And lots of typos, docs improvements, revamped examples, and general fixes!