Error upgrading master branch

[henrywright]

When using ./nodebb upgrade, I get the following error:

Error: Command failed: npm WARN package.json nodebb-theme-test@2.1.8 No README data
npm WARN deprecated pngjs2@2.0.0: pngjs2 has now taken over the original pngjs package on npm. Please change to use pngjs dependency, version 2+.

Any idea how to resolve this one?

[julian]

Looks like a warning, but not a serious one. We don't use that package in NodeBB itself so it is likely one of its dependencies