Added travis update to 2.4.1
Added travis update to 2.4.1

- .travis.yml - Updated Ruby from 2.3.0 to 2.4.1

Updates #995, #821

EBWiki/EBWiki,BOWiki/BOW,BOWiki/BOW,BOWiki/BOW,EBWiki/EBWiki,EBWiki/EBWiki,EBWiki/EBWiki