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Update required for init_app method

Hello,

I am trying to use flask-wdb via the pattern

wdb = Wdb()
wdb.init_app(app)

I am getting this error
File "/usr/local/lib/python3.8/site-packages/flask_wdb.py", line 18, in init_app
app.wsgi_app = WdbMiddleware(app.wsgi_app, start_disabled, theme)
TypeError: init() takes from 2 to 3 positional arguments but 4 were given

I think a little update is needed.

how to use in application factory?

i do it like this in init.py

from flask import Flask
from flask.ext.bootstrap import Bootstrap
from flask.ext.moment import Moment
from flask.ext.sqlalchemy import SQLAlchemy
from config import config
from flask_wtf.csrf import CsrfProtect
from flask.ext.mongoengine import MongoEngine
from flask_wdb import Wdb


bootstrap = Bootstrap()
moment = Moment()
db = MongoEngine()
csrf = CsrfProtect()
wdb = Wdb()


def create_app(config_name):
    app = Flask(__name__)
    app.config.from_object(config[config_name])
    config[config_name].init_app(app)

    bootstrap.init_app(app)
    moment.init_app(app)
    db.init_app(app)
    wdb.init_app(app)
    csrf = CsrfProtect(app)

    from .main import main as main_blueprint
    app.register_blueprint(main_blueprint)

    return app

but there's an error:

Traceback (most recent call last):
  File "manage.py", line 15, in <module>
    app = create_app(os.getenv('FLASK_CONFIG') or 'default')
  File "/home/go/brand_new/app/__init__.py", line 27, in create_app
    wdb.init_app(app)
  File "/home/go/flasky/flasky/local/lib/python2.7/site-packages/flask_wdb.py", line 18, in init_app
    app.wsgi_app = WdbMiddleware(app.wsgi_app, start_disabled, theme)
TypeError: __init__() takes at most 3 arguments (4 given)

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