Better clarify supported node versions

[jr-cologne]

Hi there, dear Hacktoberfest contributors,

it would be good if we could better clarify which node versions are supported by this Gulp Starter Kit.

I think, it would be enough to add a more specific description of our requirements with regards to Node.js to our README file. But, in case you've any better ideas how to better clarify supported node versions, feel free to suggest them.

Here's a quick list about what is involved in this issue:

• Comment here to let others know you would like to take this issue
• Follow our quick contributing guide starting from step 2
• Check out the required node versions of the project's dependencies
• Consider v8+ as the requirement, but make sure all dependencies match this requirement
• Make your changes to the documentation to inform users about our supported node versions

All right, have fun and celebrate Hacktoberfest with us! 🎉

Thank you very much in advance, I really appreciate your contribution!

Best regards,
@jr-cologne

[drishit96]

I would like to work on this

[drishit96]

For specifying a specific Node.js version, the engines field in package.json can be used.
As mentioned here: https://stackoverflow.com/a/29349773/5987223

[jr-cologne]

Cool, go for it! 👍

Feel free to add the engines field to package.json as well.