ProxyFix import issue has been fixed.

Author: Afiz

examples/complex.py

@@ -1,5 +1,5 @@
 from flask import Flask
-from werkzeug.contrib.fixers import ProxyFix
+from werkzeug.middleware.proxy_fix import ProxyFix
 
 from zoo import api
 

examples/todo.py

@@ -1,6 +1,6 @@
 from flask import Flask
 from flask_restx import Api, Resource, fields
-from werkzeug.contrib.fixers import ProxyFix
+from werkzeug.middleware.proxy_fix import ProxyFix
 
 app = Flask(__name__)
 app.wsgi_app = ProxyFix(app.wsgi_app)

examples/todomvc.py

@@ -1,6 +1,6 @@
 from flask import Flask
 from flask_restx import Api, Resource, fields
-from werkzeug.contrib.fixers import ProxyFix
+from werkzeug.middleware.proxy_fix import ProxyFix
 
 app = Flask(__name__)
 app.wsgi_app = ProxyFix(app.wsgi_app)