HTML Purifier 4.15.0 and new GitHub release process announcement

[Edward Z. Yang]

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HTML Purifier 4.15.x is a maintenance release which improves
compatibility with PHP8.2.  There is also support for
contenteditable="false" added.

After this release, we plan to switch to GitHub based tooling
for releases.  We may not update the website for subsequent
releases; please see GitHub/Composer for latest release information.

Release notes for 4.15.0:
    https://github.com/ezyang/htmlpurifier/blob/v4.15.0/NEWS

Download links for 4.15.0:
    http://htmlpurifier.org/releases/htmlpurifier-4.15.0.tar.gz
    http://htmlpurifier.org/releases/htmlpurifier-4.15.0.zip

SHA-1 sums:
    174f50a0765dd767e9ab4ba9911f490895faa400  htmlpurifier-4.15.0.tar.gz
    b71263ab93f48c32f6ef1375d18ffe43972369fb  htmlpurifier-4.15.0.zip

Other downloads (standalone and lite):
    http://htmlpurifier.org/download.html
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