Log Message:
mitmproxy: Update to 5.1.1

Changes:
5.1.1
-----
    * Fixed Docker images not starting due to missing shell

5.1
---
  ** Major Changes **
    * Initial Support for TLS 1.3

  ** Full Changelog **
    * Reduce leaf certificate validity to one year due to upcoming browser
      changes (@mhils)
    * Rename mitmweb's web_iface option to web_host for consistency (@oxr463)
    * Sending a SIGTERM now exits mitmproxy without prompt, SIGINT still
      asks (@ThinkChaos)
    * Don't force host header on outgoing requests (@mhils)
    * Additional documentation and examples for WebSockets (@Kriechi)
    * Gracefully handle hyphens in domain names (@matosconsulting)
    * Fix header replacement count (@naivekun)
    * Emit serverconnect event only after a connection has been
      established (@Prinzhorn)
    * Fix ValueError in table mode of server replay flow (@ylmrx)
    * HTTP/2: send all stream reset types to other connection (@rohfle)
    * HTTP/2: fix WINDOW_UPDATE swallowed on closed streams (@Kriechi)
    * Fix wrong behavior of --allow-hosts options (@BlownSnail)
    * Additional and updated documentation for examples, WebSockets,
      Getting Started (@Kriechi)