Run update.sh

sentry/README.md

@@ -14,6 +14,10 @@ WARNING:
 
 -->
 
+# **DEPRECATION NOTICE**
+
+This image is deprecated in favor of the full installation explained over at [Self-Hosted Sentry Docs](https://develop.sentry.dev/self-hosted/) (last updated July 2019; [getsentry/docker-sentry#189](https://github.com/getsentry/docker-sentry/pull/189).
+
 # Quick reference
 
 -	**Maintained by**: