Missing highlight.js package

[Alessar]

• Repro steps:
  npm install doczar
./node_modules/.bin/doczar
• Expected:
  Some documentation should be created
• Actual:
  unexpected filesystem output error
Error: ENOENT: no such file or directory,
lstat '...\node_modules\doczar\node_modules\highlight.js\styles\github.css'
• Investigation:
  Looks like, it is needed to add dependency of highlight.js.
  After it documentation will be created.