Update bower package so that it actually works

- npm pls
1 job for 4-bootstrap4-sass-only in 22 seconds
Status Job ID Name Coverage
  Test
failed #1725
build_css

00:00:22

 
Name Stage Failure
failed
build_css Test There is an unknown failure, please try again
npm ERR! peerinvalid Peer grunt-contrib-sass@0.7.4 wants grunt@>=0.4.0
npm ERR! peerinvalid Peer grunt-autoprefixer@1.0.1 wants grunt@~0.4.2
npm ERR! peerinvalid Peer grunt-contrib-watch@0.5.3 wants grunt@~0.4.0
npm ERR! peerinvalid Peer grunt-contrib-connect@0.8.0 wants grunt@~0.4.0
npm ERR! peerinvalid Peer grunt-contrib-less@0.9.0 wants grunt@~0.4.0

npm ERR! Please include the following file with any support request:
npm ERR! /builds/srct/masonstrap/npm-debug.log
ERROR: Build failed: exit code 1