5.2.0 (stable):

• Use callback functions with C linkage
  (Kjell Ahlstedt) Issue glibmm#1 (Murray Cumming)

Documentation:

• Update Visual Studio build docs
  (Chun-wei Fan) Pull request #52
• Remove AUTHORS and add general information to README.md
  (Kjell Ahlstedt) Issue gtkmm#140
• Parser docs: Add a link to parser options
• README.md: Add info about building the documentation
  (Kjell Ahlstedt)

Meson build:

• Cleanup and fix libxml2 dep search
  (Chun-wei Fan) Pull request #51
• Don't fail if warning_level=everything
  (Daniel Boles, Kjell Ahlstedt) Merge request gtkmm!87
• Add bcrypt dependency when libxml2 is a subproject
  Issue #64 (Kjell Ahlstedt)
  (Andrew Potter) Pull request #65
• Don't require the 'dot' command to build the documentation
  (Kjell Ahlstedt) Issue libsigcplusplus#98
• Add the build-manual option
  (Kjell Ahlstedt)

Build:

• Make it compatible with libxml2 >= 2.12.0
  by modifying #include directives
  (Kjell Ahlstedt)