Update deprecated underscore CLI flags in README

[parkour86]

Summary

Updates the README to use the new dash-style CLI flags, eliminating deprecation warnings emitted by Config.fixArgs when users follow the documented examples.

Motivation

Running EpixNet with the flags as documented currently produces warnings such as:

WARNING: using deprecated flag in command line: --tor_controller should be --tor-controller
WARNING: using deprecated flag in command line: --tor_proxy should be --tor-proxy
Support for deprecated flags might be removed in the future

Since support for the underscore variants may be removed in the future, the documentation should steer users toward the supported syntax.

Changes

Replaced underscore flags with their dashed equivalents in README.md:

• --tor_proxy → --tor-proxy
• --tor_controller → --tor-controller
• --ui_port → --ui-port
• --data_dir → --data-dir

Notes

• Documentation-only change; no code or behavior is affected.
• The deprecated flags still work at runtime, so this is non-breaking for existing users.