Merge branch 'master' into develop

* master:
  Bump v3.0.0
  Add error handling
  Support parse html page #19
  Add test
  Support file contents
  Fix utii.functions
  Fix duble quations
  Fix typo in README
Update dependency mocha
Change CLI option name
move assets
brush up output way
remove fs requiring
refactoring
Merge pull request #44 from 1000ch/develop

Rafactoring
Fix readme
Merge pull request #43 from t32k/develop

Released v3.0.0