fix _add_writer

Author: kumaraditya303

Lib/asyncio/selector_events.py

@@ -309,9 +309,9 @@ def _remove_reader(self, fd):
         else:
             return False
 
-    def _add_writer(self, fd, callback, *args):
+    def _add_writer(self, fd, callback, *args, context=None):
         self._check_closed()
-        handle = events.Handle(callback, args, self, None)
+        handle = events.Handle(callback, args, self, context=context)
         key = self._selector.get_map().get(fd)
         if key is None:
             self._selector.register(fd, selectors.EVENT_WRITE,