4.2.0 (stable):

• Node: Add eval_xpath().
  (Kjell Ahlstedt) Issue #66 (Marie Preusse)
• Use callback functions with C linkage
  (Kjell Ahlstedt) Issue glibmm#1 (Murray Cumming)
• Parser: Ignore deprecation of xmlParserCtxt members.
  (Kjell Ahlstedt)

Documentation:

• Don't link to removed developer-old.gnome.org or removed parts
  of library.gnome.org.
  (Kjell Ahlstedt)

Meson build:

• Require python3 >= 3.7. That's what Meson requires.
• Require meson >= 0.62.
• Use Meson's pkgconfig module instead of the libxml++.pc.in template.
  (Kjell Ahlstedt)