Added Prophet to readme

Author: ankane

README.md

@@ -120,11 +120,11 @@ check_schedules:
 
 # enable anomaly detection
 # note: with trend, time series are sent to https://trendapi.org
-# anomaly_checks: trend / anomaly_detection
+# anomaly_checks: prophet / trend / anomaly_detection
 
 # enable forecasting
 # note: with trend, time series are sent to https://trendapi.org
-# forecasting: trend
+# forecasting: prophet / trend
 
 # enable map
 # mapbox_access_token: <%= ENV["MAPBOX_ACCESS_TOKEN"] %>