* [gftools-packager] Zen Old Mincho: Version 1.500 added
* Zen Old Mincho Version 1.500 taken from the upstream repo https://github.com/googlefonts/zen-oldmincho.git at commit fb46620f2f.
* [gftools-packager] ofl/zenoldmincho remove METADATA "source". google/fonts#2587
* Update METADATA.pb
* Update upstream.yaml