Travis Build Failure - 'eslint not found'

[kchadha]

Job # 5 of a PR build failed with the following:

sh: 1: eslint: not found
npm ERR! file sh
npm ERR! code ELIFECYCLE
npm ERR! errno ENOENT
npm ERR! syscall spawn
npm ERR! scratch-vm@0.1.0 lint: `eslint . && format-message lint src/**/*.js`
npm ERR! spawn ENOENT
npm ERR! 
npm ERR! Failed at the scratch-vm@0.1.0 lint script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR!     /home/travis/.npm/_logs/2018-06-14T21_03_07_442Z-debug.log