:ant: Fix for Travis CI build problem with autoprefixer
:ant: Fix for Travis CI build problem with autoprefixer

/home/travis/build/kh0p/khop-theme/node_modules/gulp-autoprefixer/node_modules/postcss/lib/lazy-result.js:157
this.processing = new Promise(function (resolve, reject) { ReferenceError: Promise is not defined

kh0p/khop-theme,kh0p/khop-theme,kh0p/khop-theme,kh0p/khop-theme