blueprint demo issue

[JackyChou]

I found that blueprint demo in Readme register like

app.register_blueprint(html, url_prefix=r'/')
sockets.register_blueprint(ws, url_prefix=r'/')

actually this usage will got 404.

Maybe register like this is better

app.register_blueprint(html)
sockets.register_blueprint(ws)

or

app.register_blueprint(html, url_prefix=r'/test')
sockets.register_blueprint(ws, url_prefix=r'/test')

Thank you for your time.

[dragonwt]

great ! please change example ,I have work all night until i find this.