UPGRADING.adoc, NEWS.adoc: mention changes in tools/gitlog2changelog.py.in [#2360, #2366]

Signed-off-by: Jim Klimov <jimklimov+nut@gmail.com>

Author: jimklimov

NEWS.adoc

@@ -221,6 +221,12 @@ https://github.com/networkupstools/nut/milestone/10
    known deficiencies in Windows platform support, as well as some un-awareness
    about configuration key words which appeared in NUT since 2013. [#2290]
 
+ - The `tools/gitlog2changelog.py.in` script was revised, in particular to
+   convert section titles (with contributor names coming from Git metadata)
+   into plain ASCII character set, for `dblatex` versions which do not allow
+   diacritics and other kinds of non-trivial characters in sections. This can
+   cause successful builds of `ChangeLog.pdf` file on more platforms, but at
+   expense of a semi-cosmetic difference in those names. [PR #2360, PR #2366]
 
 Release notes for NUT 2.8.1 - what's new since 2.8.0
 ----------------------------------------------------

UPGRADING.adoc

@@ -44,6 +44,13 @@ Changes from 2.8.1 to 2.8.2
   appear as comments, or enabled by specifying the `-U` command-line
   option several times. [#2221]
 
+- The `tools/gitlog2changelog.py.in` script was revised, in particular to
+  convert section titles (with contributor names) into plain ASCII character
+  set, for `dblatex` versions which do not allow diacritics and other kinds
+  of non-trivial characters in sections. A number of other projects seem to
+  use the NUT version of the script, and are encouraged to look at related
+  changes in `configure.ac` and `Makefile.am` recipes. [PR #2360, PR #2366]
+
 Changes from 2.8.0 to 2.8.1
 ---------------------------