manual update highlight.js to 8.3.0
Merge branch 'master' of https://github.com/lwohtsu/grunt-makdown-custom-inddxml

# By lwohtsu
# Via lwohtsu
* 'master' of https://github.com/lwohtsu/grunt-makdown-custom-inddxml:
  Update README.md
  Update README.md
  Update README.md