Update README.md

Wording.

Author: baudneo

README.md

@@ -19,7 +19,7 @@
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 # Updated
-- Now running Debian Bullseye as base OS.
+- Now running Debian Bullseye as base OS in the tagged image 'bullseye'.
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 This project comes as a pre-built docker image that enables you to easily forward to your websites
 running at home or otherwise, including free SSL, without having to know too much about Nginx or Letsencrypt.