fixed passing header

Author: chillaq

splitio/push/sse.py

@@ -247,7 +247,7 @@ async def start(self, url, extra_headers=None, timeout=_DEFAULT_ASYNC_TIMEOUT):
             self._conn = aiohttp.connector.TCPConnector()
             async with aiohttp.client.ClientSession(
                 connector=self._conn,
-                headers={'accept': 'text/event-stream'},
+                headers=headers,
                 timeout=aiohttp.ClientTimeout(timeout)
                 ) as self._session:
                 reader = await self._session.request(