Bump opower to 0.16.0 (home-assistant#160348)

Author: tronikos

homeassistant/components/opower/manifest.json

@@ -9,5 +9,5 @@
   "iot_class": "cloud_polling",
   "loggers": ["opower"],
   "quality_scale": "bronze",
-  "requirements": ["opower==0.15.9"]
+  "requirements": ["opower==0.16.0"]
 }