Merge pull request #3 from influxdata/jdstrand/update-readme

chore: update README.md to point to InfluxCommunity/influxdb-rails

Author: jdstrand

README.md

@@ -1,3 +1,7 @@
+> :warning: This repository is archived. Please use and direct all issues and
+> pull requests to the community-maintained fork at
+> https://github.com/InfluxCommunity/influxdb-rails instead
+
 > :warning: You are looking at the README of an unmaintained development branch
 > of this gem. If you are using this gem you should have a look at the
 > latest [released version (1.0.3)](https://github.com/InfluxCommunity/influxdb-rails/tree/v1.0.3#readme)