Replaced get_event_loop with get_running_loop (Fixes #384)

Author: miguelgrinberg

src/engineio/async_client.py

@@ -37,7 +37,7 @@ async def _handler():  # pragma: no cover
         for task in tasks:
             task.cancel()
         await asyncio.gather(*tasks, return_exceptions=True)
-        asyncio.get_event_loop().stop()
+        asyncio.get_running_loop().stop()
 
     asyncio.ensure_future(_handler())
 
@@ -109,7 +109,7 @@ async def connect(self, url, headers=None, transports=None,
         if self.handle_sigint and not async_signal_handler_set and \
                 threading.current_thread() == threading.main_thread():
             try:
-                asyncio.get_event_loop().add_signal_handler(
+                asyncio.get_running_loop().add_signal_handler(
                     signal.SIGINT, async_signal_handler)
             except NotImplementedError:  # pragma: no cover
                 self.logger.warning('Signal handler is unsupported')

src/engineio/async_server.py

@@ -528,6 +528,7 @@ async def run_sync_handler():
 
     async def _service_task(self):  # pragma: no cover
         """Monitor connected clients and clean up those that time out."""
+        loop = asyncio.get_running_loop()
         self.service_task_event = self.create_event()
         while not self.service_task_event.is_set():
             if len(self.sockets) == 0:
@@ -569,7 +570,7 @@ async def _service_task(self):  # pragma: no cover
                 self.logger.info('service task canceled')
                 break
             except:
-                if asyncio.get_event_loop().is_closed():
+                if loop.is_closed():
                     self.logger.info('event loop is closed, exiting service '
                                      'task')
                     break