[gxml] Created tag 0.18.1

[Daniel Espinosa Ortiz <despinosa src gnome org>]

The signed tag '0.18.1' was created.

Tagger: Daniel Espinosa <esodan gmail com>
Date: 1562593213 -0500

    Release 0.18.1

Changes since the last tag '0.18.0':

Daniel Espinosa (6):
      GParser: fix create_stream() using string.data
      Set version to 0.18.1
      Set version to 0.18.1
      meson: adding tests files for distribution on autotools
      meson: Rename options
      CI: updated meson options

Tom Schoonjans (1):
      build: add support for darwin_versions