Upgrade zeroconf to 0.21.0 (#16647)

homeassistant/components/zeroconf.py

@@ -12,7 +12,7 @@ import voluptuous as vol
 from homeassistant import util
 from homeassistant.const import (EVENT_HOMEASSISTANT_STOP, __version__)
 
-REQUIREMENTS = ['zeroconf==0.20.0']
+REQUIREMENTS = ['zeroconf==0.21.0']
 
 _LOGGER = logging.getLogger(__name__)
 

requirements_all.txt

@@ -1523,7 +1523,7 @@ youtube_dl==2018.09.10
 zengge==0.2
 
 # homeassistant.components.zeroconf
-zeroconf==0.20.0
+zeroconf==0.21.0
 
 # homeassistant.components.climate.zhong_hong
 zhong_hong_hvac==1.0.9