mm-common 1.0.6 (2024-01-07)

* MM_AX_CXX_COMPILE_STDCXX(): Support C++20
  (Murray Cumming) Issue #3
* util/meson_aux/libstdcxx-tag.py: Try curl without compression
  (Kjell Ahlstedt) Issue libsigcplusplus#98

Meson build:
* Fix use as subproject on Windows
  Issue libsigcplusplus#89 (Dan Liebault)
  (Chun-wei Fan) Merge request !7
* Don't fail if warning_level=everything
* Meson: Donʼt fail if warning_level=everything
  (Daniel Boles, Kjell Ahlstedt) Merge request gtkmm!87

Skeletonmm:
* Fix the evaluation of is_git_build on Windows
  (Kjell Ahlstedt) Issue gtkmm#131 (William Roy)
* Simplify if-file-exists test
  (Kjell Ahlstedt)

Documentation:
* Remove AUTHORS and add info to README.md
  (Kjell Ahlstedt) Issue gtkmm#140