gulp-notify and gulp-plumber, ReferenceError: through is not defined

[richardegil]

In the https://www.npmjs.com/package/gulp-notify#notes-tip section you provide an example of using gulp-notify and gulp-plumber together. Every time I try to run it I get the following error:

ReferenceError: through is not defined

I have tried using gulp-through and through-pipes to help resolve this but it just leads to more errors. Am I missing something? Am I using the wrong through library?

Here is my gulpfile https://gist.github.com/richardegil/9c513f8819e8ef25480c