add date statement to README for monitoring v3

README.md

@@ -34,7 +34,12 @@ Fog implements [v1](https://cloud.google.com/dns/api/v1/) of the Google Cloud DN
 
 ## Monitoring
 
-Fog implements [v3](https://cloud.google.com/monitoring/api/ref_v3/rest/) of the Google Cloud Monitoring API. We are always looking for people to improve our code and test coverage, so please [file issues](https://github.com/fog/fog-google/issues) for any anomalies you see or features you would like.
+Fog mostly implements [v3](https://cloud.google.com/monitoring/api/ref_v3/rest/) of the Google Cloud Monitoring API. 
+
+As of 2017-09-26, some less common API methods are missing and may be added as requested. Feature requests or pull requests for 
+additions are welcome. 
+
+We are always looking for people to improve our code and test coverage, so please [file issues](https://github.com/fog/fog-google/issues) for any anomalies you see or features you would like.
 
 ## Pubsub