Changes in version 3.0 (2020-06-04)                   

    o   New function google_fonts() to assist installing Google Fonts
	to the local machine, suggested by @thomas-neitmann (sysfonts
	issue #12).

    o   Fixed a font loading issue when a font directory exists but
	with no files inside, thanks to the debugging by @yihui and
	@XiangyunHuang (showtext issue #30).

    o   showtextdb will now test for write permission before installing
	and extracting font files.

                  Changes in version 2.0 (2017-09-11)                   

    o   New function font_install() to install fonts to the local
	machine.

    o   New function font_installed() to list locally installed fonts.

    o   New functions source_han_sans() and source_han_serif() to
	assist installing the Source Han Sans/Serif fonts.

                  Changes in version 1.0 (2015-03-10)                   

    o   The initial version that separated the font file from the
	showtext package.