Tweak README for v1. (#881)

Author: robholland

README.md

@@ -1,9 +1,7 @@
 # Temporal Helm Chart
 [![FOSSA Status](https://app.fossa.com/api/projects/git%2Bgithub.com%2Ftemporalio%2Ftemporal-helm-charts.svg?type=shield)](https://app.fossa.com/projects/git%2Bgithub.com%2Ftemporalio%2Ftemporal-helm-charts?ref=badge_shield)
 
-> **Note:** This version is currently an RC (release candidate). To install it, you must specify the version using `--version '>=1.0.0-0'` in your helm install command.
-
-> **For existing users:** If you're upgrading from a previous version of the Temporal Helm chart, please see [UPGRADING.md](UPGRADING.md) for important migration information and breaking changes.
+> **For users upgrading from 0.x releases:** Please see [UPGRADING.md](UPGRADING.md) for important migration information and breaking changes.
 
 Temporal is a distributed, scalable, durable, and highly available orchestration engine designed to execute asynchronous long-running business logic in a resilient way.