Error on `require` when using Node.js pre-7.6

[cedx]

Error on `require` when using Node.js pre-7.6

[agbottan]

@rivajunior , I had this same problem. It's because of the 'async' keyword which is a new feature in ES7.
I fixed the problem updating my node.js to version 8.
They say it works on version 7, but I didn't tested.

[cedx]

@agbottan found the issue : I'm using async/await functions in this package. These ES2017 features require a Node.js 7.6+ runtime.

@rivajunior, you must either upgrade your Node.js runtime, or downgrade the gulp-php-minify version to 1.1.0 (the last one working with a pre-7.6 runtime). But beware : there was some issues with old versions. You should really consider to upgrade your Node.js runtime (v8 will be the next LTS in a few months).