doc updates from feedback

README.md

@@ -4,9 +4,9 @@ This is a [Heroku buildpack](http://devcenter.heroku.com/articles/buildpacks) th
 allows an application to use an [stunnel](http://stunnel.org) to connect securely to
 Heroku Redis.  It is meant to be used in conjunction with other buildpacks.
 
-**This buildpack is only for use with Heroku Redis 4 and 5. For Heroku Redis 6 and newer, use its built-in TLS support instead.**
-
-**For more information, see [Securing Heroku Redis](https://devcenter.heroku.com/articles/securing-heroku-redis).**
+> [!WARNING]
+> This buildpack is not compatible with `heroku-24`+ and is not needed for Redis 6+, which supports native TLS.
+> For more information, see [Securing Heroku Redis](https://devcenter.heroku.com/articles/heroku-redis#security-and-compliance).
 
 ## Usage
 

bin/compile

@@ -13,11 +13,12 @@ unset GIT_DIR
 BUILD_DIR=$1
 BUILDPACK_DIR="$(dirname $(dirname $0))"
 
-STUNNEL=$(command -v stunnel4)
-
-if [ -z $STUNNEL ]; then
-    echo "------> stunnel not detected! stunnel not supported on heroku-24+"
-    echo "------> this buildpack is not required for Redis 6+: https://devcenter.heroku.com/articles/heroku-redis#security-and-compliance"
+if ! command -v stunnel4 > /dev/null; then
+    echo "!     stunnel not detected! stunnel not supported on heroku-24+"
+    echo "!     This buildpack is not required for Redis 6+. Remove this buildpack using:"
+    echo "!         $ heroku buildpacks:remove heroku/redis"
+    echo "!     And then follow the instructions for using Redis' native TLS support:"
+    echo "!     https://devcenter.heroku.com/articles/heroku-redis#security-and-compliance"
     exit 1
 fi
 

bin/start-stunnel

@@ -1,14 +1,6 @@
 #!/usr/bin/env bash
 
 main() {
-  STUNNEL=$(command -v stunnel4)
-
-  if [ -z $STUNNEL ]; then
-      echo "buildpack=stunnel at=error stunnel not detected! stunnel not supported on heroku-24+"
-      echo "buildpack=stunnel at=error this buildpack is not required for Redis 6+: https://devcenter.heroku.com/articles/heroku-redis#security-and-compliance"
-      exit 1
-  fi
-
   if ! is-enabled "${STUNNEL_ENABLED:-1}"; then
     at stunnel-disabled
     exec "$@"