5.2.1 (stable):

* Parser: Ignore deprecation of xmlParserCtxt members.
  (Kjell Ahlstedt)

Documentation:
* Don't link to removed developer-old.gnome.org.
  (Kjell Ahlstedt)

Meson build:
* Use libxml2 meson build when libxml2 is built as a subproject.
  (Andrew Potter) Issue #67, Pull request #68
* Require python3 >= 3.7. That's what Meson requires.
  (Kjell Ahlstedt)