PostCSS plugin added cachebuster to local files based on their datechanged.
.foo {
/* Input example */
background-image : url('../images/index/logo.png')
}
.foo {
/* Output example */
background-image : url('../images/index/logo.png?v14f32a475b8')
}
postcss([ require('postcss-cachebuster') ])
See PostCSS docs for examples for your environment.