Revert "Bump nokogiri from 1.10.4 to 1.10.8 in /docs (#399)" (#401)
Revert "Bump nokogiri from 1.10.4 to 1.10.8 in /docs (#399)" (#401)

This reverts commit fff9763520cde7f17b86b4966a33b6f162306695.
google/charts,google/charts