Update README

v0.6.9: Add more rules and fix an bug of waf function

v0.6.7: Add more functionality into webui

0.6.6: Better webui and more rules

v0.6.5: More rules and improve ability for attacking python2 target

v0.6.0.1: Some bug fixes

v0.5.8: Auto 500 FIX!

v0.5.5.1: change theme to a builtin one

v0.5.5: better interactive terminal.

Update demo