[security] vulnerabilities being found in dependencies by npm

[denismakogon]

from recent fdk builds:

added 241 packages from 175 contributors and audited 657 packages in 2.746s
found 4 vulnerabilities (2 moderate, 2 high)
  run `npm audit fix` to fix them, or `npm audit` for details

not a nodejs expert, but i guess this should be fixed.