Log Message:
py-cairo: update to 1.18.0.

1.18.0 - 2018-11-04
-------------------

Build:
  * Dropped Python 3.3 support
  * meson build requires meson >=0.47 (was >=0.46)
  * Fix various build warnings with GCC8
  * meson: Don't link against libpython on non-Windows systems :pr:`120`
  * meson: Improve support for Visual Studio builds
    :pr:`121` (:user:`Chun-wei Fan <fanc999>`)
  * setup.py: Support specifying custom ``--pkgconfigdir``
    :pr:`127` (:user:`Michał Górny <mgorny>`)

Fixes:
  * docs: Remove a broken link :pr:`124` (:user:`Nik Nyby <nikolas@gnu.org>`)
  * typing: Add missing annotations for __enter__/__exit__ :pr:`126`

New API:
  Some are only available when building with newer cairo versions, see the
  linked API docs for details.

  * :data:`CAIRO_VERSION`, :data:`CAIRO_VERSION_STRING`,
    :data:`CAIRO_VERSION_MAJOR`, :data:`CAIRO_VERSION_MINOR`,
    :data:`CAIRO_VERSION_MICRO`
  * :attr:`Status.TAG_ERROR`, :attr:`Status.FREETYPE_ERROR`,
    :attr:`Status.PNG_ERROR`, :attr:`Status.WIN32_GDI_ERROR`
  * :class:`SVGUnit`, :class:`PDFMetadata`, :class:`PDFOutlineFlags`
  * :meth:`FontOptions.set_variations`, :meth:`FontOptions.get_variations`
  * :meth:`Context.tag_begin`, :meth:`Context.tag_end`,
    :data:`TAG_DEST`, :data:`TAG_LINK`
  * :meth:`PDFSurface.set_page_label`, :meth:`PDFSurface.set_metadata`,
    :meth:`PDFSurface.set_thumbnail_size`, :meth:`PDFSurface.add_outline`,
    :data:`PDF_OUTLINE_ROOT`
  * :meth:`SVGSurface.set_document_unit`, :meth:`SVGSurface.get_document_unit`
  * :data:`MIME_TYPE_CCITT_FAX`, :data:`MIME_TYPE_CCITT_FAX_PARAMS`,
    :data:`MIME_TYPE_EPS`, :data:`MIME_TYPE_EPS_PARAMS`,
    :data:`MIME_TYPE_JBIG2`, :data:`MIME_TYPE_JBIG2_GLOBAL`,
    :data:`MIME_TYPE_JBIG2_GLOBAL_ID`