Add warning if using JupyterDash

Author: T4rk1n

dash/dash.py

@@ -3,6 +3,7 @@
 import sys
 import collections
 import importlib
+import warnings
 from contextvars import copy_context
 from importlib.machinery import ModuleSpec
 import pkgutil
@@ -511,6 +512,9 @@ def __init__(  # pylint: disable=too-many-statements
 
         self.logger.setLevel(logging.INFO)
 
+        if self.__class__.__name__ == "JupyterDash":
+            warnings.warn("JupyterDash is deprecated, use Dash instead.")
+
     def init_app(self, app=None, **kwargs):
         """Initialize the parts of Dash that require a flask app."""