updated dependencies and fixed linter error

examples/wsgi/django_example/requirements.txt

@@ -1,8 +1,8 @@
-Django==1.11.1
+django==2.1.3
 enum-compat==0.0.2
 eventlet==0.21.0
 greenlet==0.4.12
 python-engineio
 python-socketio
-pytz==2017.2
+pytz==2018.7
 six==1.10.0

examples/wsgi/requirements.txt

@@ -1,15 +1,15 @@
-click==6.7
+Click-7.0
 enum-compat==0.0.2
 enum34==1.1.6
 eventlet==0.20.1
-Flask==0.12
+Flask==1.0.2
 greenlet==0.4.12
-itsdangerous==0.24
+itsdangerous==1.1.0
-Jinja2==2.9.5
+Jinja2==2.10
-MarkupSafe==0.23
+MarkupSafe==1.1.0
 packaging==16.8
 pyparsing==2.1.10
 python-engineio
 python-socketio
-six==1.10.0
+six==1.11.0
-Werkzeug==0.11.15
+Werkzeug==0.14.1

socketio/zmq_manager.py

@@ -57,7 +57,7 @@ class ZmqManager(PubSubManager):  # pragma: no cover
                                '(Run "pip install pyzmq" in your '
                                'virtualenv).')
 
-        r = re.compile(':\d+\+\d+$')
+        r = re.compile(r':\d+\+\d+$')
         if not (url.startswith('zmq+tcp://') and r.search(url)):
             raise RuntimeError('unexpected connection string: ' + url)