Fix: Fix missing word in README.md

...apparently I forgot a key word.

README.md

@@ -109,7 +109,7 @@ unsuitable to link to packages with GPL-incompatible licenses. As a result Alpin
 > `/etc/postfix/main.cf` using `hash` and `btree` must be changed to a supported alternative. See the
 > [Postfix lookup table documentation](http://www.postfix.org/DATABASE_README.html) for more information.
 
-While this should affect most of the users (`/etc/postfix/main.cf` is managed by this image), there might be use cases where
+While this should not affect most of the users (`/etc/postfix/main.cf` is managed by this image), there might be use cases where
 people have their own configuration which relies on `hash` and `btree` databases. To avoid braking live systems, the version of this
 image has been updated to `v3.0.0.`.