Update test.log

[akalangara]

[AppVeyorBot]

If the message below is truncated, see https://ci.appveyor.com/project/yihui/latex-pass/builds/41771875 for the full version.

The missing packages identified from the LaTeX log are:

amsmath latex-amsmath-dev

If you are an R user using TinyTeX, you may install these packages via:

tinytex::tlmgr_install(c('amsmath', 'latex-amsmath-dev'))

If you use TinyTeX, including LaTeX for Manim (https://chocolatey.org/packages/manim-latex), you may install these packages via command line:

tlmgr install amsmath latex-amsmath-dev

If you do not use TinyTeX (https://yihui.org/tinytex/), you need to figure out how to install them by yourself.