fix live attribute again (#13)

custom_components/youtube/sensor.py

@@ -117,7 +117,7 @@ async def is_live(url, name, hass, session):
         async with async_timeout.timeout(10, loop=hass.loop):
             response = await session.get(url)
             info = await response.text()
-        if '{"key":"is_viewed_live","value":"True"}' in info:
+        if 'Started streaming' in info:
             returnvalue = True
             _LOGGER.debug('%s - Latest Video is live', name)
     except Exception as error:  # pylint: disable=broad-except