Solved Postfix "header_checks" removed?

When I upgraded mail/postfix to the latest version, it states that "header_checks" are no longer a part of Postfix.

I can't find any information on the Postfix website to back these claims up.

Anyone know what that's all about?
Code:
[1/1] Extracting postfix-3.4.5,1: 100%
You may need to manually remove /usr/local/etc/postfix/main.cf if it is no longer needed.
You may need to manually remove /usr/local/etc/postfix/master.cf if it is no longer needed.

    Note: the following files or directories still exist but are
    no longer part of Postfix:

     /usr/local/etc/postfix/access /usr/local/etc/postfix/header_checks
 
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