Add exceptions from 1d4a410 to top-level imports

Author: nocarryr

pydispatch/__init__.py

@@ -15,5 +15,5 @@
                   'After version 0.1.x, `python-dispatch` will only support Python 3.6 or greater.',
                   UserWarning)
 
-from pydispatch.dispatch import Dispatcher, Event
+from pydispatch.dispatch import *
 from pydispatch.properties import *

pydispatch/dispatch.py

@@ -9,6 +9,10 @@
 import asyncio
 from pydispatch.aioutils import AioWeakMethodContainer, AioEventWaiters
 
+__all__ = (
+    'DoesNotExistError', 'ExistsError', 'EventExistsError',
+    'PropertyExistsError', 'Event', 'Dispatcher',
+)
 
 
 class DoesNotExistError(KeyError):