Update cheatsheets

mitmproxy

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# mitmproxy
+
+> An interactive man-in-the-middle HTTP proxy.
+> See also: `mitmweb`.
+> More information: <https://docs.mitmproxy.org/stable/concepts-options>.
+
+- Start `mitmproxy` with default settings:
+
+`mitmproxy`
+
+- Start `mitmproxy` bound to a custom address and port:
+
+`mitmproxy --listen-host {{ip_address}} --listen-port {{port}}`
+
+- Start `mitmproxy` using a script to process traffic:
+
+`mitmproxy --scripts {{path/to/script.py}}`
+
+- Export the logs with SSL/TLS master keys to external programs (wireshark, etc.):
+
+`SSLKEYLOGFILE="{{path/to/file}}" mitmproxy`