Add acknowledgements to perldelta

pod/perldelta.pod

@@ -342,9 +342,35 @@ List assignment now gives a compile-time error, too.  [perl #128260]
 
 =head1 Acknowledgements
 
-XXX Generate this with:
-
-  perl Porting/acknowledgements.pl v5.25.1..HEAD
+Perl 5.25.2 represents approximately 4 weeks of development since Perl 5.25.1
+and contains approximately 32,000 lines of changes across 430 files from 28
+authors.
+
+Excluding auto-generated files, documentation and release tools, there were
+approximately 27,000 lines of changes to 300 .pm, .t, .c and .h files.
+
+Perl continues to flourish into its third decade thanks to a vibrant community
+of users and developers. The following people are known to have contributed the
+improvements that became Perl 5.25.2:
+
+Aaron Crane, Andreas König, Andy Lester, Chad Granum, Chase Whitener, Chris
+'BinGOs' Williams, Craig A. Berry, Dagfinn Ilmari Mannsåker, Dan Collins,
+David Mitchell, Dominic Hargreaves, Ed Avis, Father Chrysostomos, H.Merijn
+Brand, Ivan Pozdeev, James E Keenan, Jarkko Hietaniemi, Jerry D. Hedden, Jim
+Cromie, Karl Williamson, Lukas Mai, Matthew Horsfall, Misty De Meo, Samuel
+Thibault, Sawyer X, Sullivan Beck, Tony Cook, Yves Orton.
+
+The list above is almost certainly incomplete as it is automatically generated
+from version control history. In particular, it does not include the names of
+the (very much appreciated) contributors who reported issues to the Perl bug
+tracker.
+
+Many of the changes included in this version originated in the CPAN modules
+included in Perl's core. We're grateful to the entire CPAN community for
+helping Perl to flourish.
+
+For a more complete list of all of Perl's historical contributors, please see
+the F<AUTHORS> file in the Perl source distribution.
 
 =head1 Reporting Bugs