[Notice] gulp 4 release process

The gulp 4 release process will follow that of npm. That being, 4.0 will be released when there are no more breaking changes and will be released with the next tag. This allows users to continue to get 3.x when using npm install gulp or npm install gulp@latest but users that want to explicitly use gulp 4 can install with npm install gulp@next. When everything seems stable and well tested by users in their workflows, we will change the tag on gulp 4.x to latest.

Please note that we are not ready to release gulp 4 yet due to some outstanding breaking changes in vinyl-fs.

Thank you for your patience, -The gulp team